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   <div id="projectname">VectSharp<span id="projectnumber">&#160;2.6.1</span>
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   <div id="projectbrief">A light library for C# vector graphics</div>
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  <div class="headertitle"><div class="title">ImageFormats.cs</div></div>
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<div class="fragment"><div class="line"><a id="l00001" name="l00001"></a><span class="lineno">    1</span><span class="comment">/*</span></div>
<div class="line"><a id="l00002" name="l00002"></a><span class="lineno">    2</span><span class="comment">    VectSharp - A light library for C# vector graphics.</span></div>
<div class="line"><a id="l00003" name="l00003"></a><span class="lineno">    3</span><span class="comment">    Copyright (C) 2020-2022 Giorgio Bianchini</span></div>
<div class="line"><a id="l00004" name="l00004"></a><span class="lineno">    4</span><span class="comment"></span> </div>
<div class="line"><a id="l00005" name="l00005"></a><span class="lineno">    5</span><span class="comment">    This program is free software: you can redistribute it and/or modify</span></div>
<div class="line"><a id="l00006" name="l00006"></a><span class="lineno">    6</span><span class="comment">    it under the terms of the GNU Lesser General Public License as published by</span></div>
<div class="line"><a id="l00007" name="l00007"></a><span class="lineno">    7</span><span class="comment">    the Free Software Foundation, version 3.</span></div>
<div class="line"><a id="l00008" name="l00008"></a><span class="lineno">    8</span><span class="comment"></span> </div>
<div class="line"><a id="l00009" name="l00009"></a><span class="lineno">    9</span><span class="comment">    This program is distributed in the hope that it will be useful,</span></div>
<div class="line"><a id="l00010" name="l00010"></a><span class="lineno">   10</span><span class="comment">    but WITHOUT ANY WARRANTY; without even the implied warranty of</span></div>
<div class="line"><a id="l00011" name="l00011"></a><span class="lineno">   11</span><span class="comment">    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the</span></div>
<div class="line"><a id="l00012" name="l00012"></a><span class="lineno">   12</span><span class="comment">    GNU Lesser General Public License for more details.</span></div>
<div class="line"><a id="l00013" name="l00013"></a><span class="lineno">   13</span><span class="comment"></span> </div>
<div class="line"><a id="l00014" name="l00014"></a><span class="lineno">   14</span><span class="comment">    You should have received a copy of the GNU Lesser General Public License</span></div>
<div class="line"><a id="l00015" name="l00015"></a><span class="lineno">   15</span><span class="comment">    along with this program. If not, see &lt;https://www.gnu.org/licenses/&gt;.</span></div>
<div class="line"><a id="l00016" name="l00016"></a><span class="lineno">   16</span><span class="comment">*/</span></div>
<div class="line"><a id="l00017" name="l00017"></a><span class="lineno">   17</span> </div>
<div class="line"><a id="l00018" name="l00018"></a><span class="lineno">   18</span><span class="keyword">using </span>System;</div>
<div class="line"><a id="l00019" name="l00019"></a><span class="lineno">   19</span><span class="keyword">using </span>System.Collections.Generic;</div>
<div class="line"><a id="l00020" name="l00020"></a><span class="lineno">   20</span><span class="keyword">using </span>System.IO;</div>
<div class="line"><a id="l00021" name="l00021"></a><span class="lineno">   21</span><span class="keyword">using </span>System.IO.Compression;</div>
<div class="line"><a id="l00022" name="l00022"></a><span class="lineno">   22</span><span class="keyword">using </span>System.Runtime.InteropServices;</div>
<div class="line"><a id="l00023" name="l00023"></a><span class="lineno">   23</span><span class="keyword">using </span>System.Threading;</div>
<div class="line"><a id="l00024" name="l00024"></a><span class="lineno">   24</span> </div>
<div class="line"><a id="l00025" name="l00025"></a><span class="lineno">   25</span><span class="keyword">namespace </span><a class="code hl_namespace" href="namespace_vect_sharp.html">VectSharp</a></div>
<div class="line"><a id="l00026" name="l00026"></a><span class="lineno">   26</span>{<span class="comment"></span></div>
<div class="line"><a id="l00027" name="l00027"></a><span class="lineno">   27</span><span class="comment">    /// &lt;summary&gt;</span></div>
<div class="line"><a id="l00028" name="l00028"></a><span class="lineno">   28</span><span class="comment">    /// Contains methods to create animated PNG image files.</span></div>
<div class="line"><a id="l00029" name="l00029"></a><span class="lineno">   29</span><span class="comment">    /// &lt;/summary&gt;</span></div>
<div class="line"><a id="l00030" name="l00030"></a><span class="lineno"><a class="line" href="class_vect_sharp_1_1_animated_p_n_g.html">   30</a></span><span class="comment"></span>    <span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">class </span><a class="code hl_class" href="class_vect_sharp_1_1_animated_p_n_g.html">AnimatedPNG</a></div>
<div class="line"><a id="l00031" name="l00031"></a><span class="lineno">   31</span>    {<span class="comment"></span></div>
<div class="line"><a id="l00032" name="l00032"></a><span class="lineno">   32</span><span class="comment">        /// &lt;summary&gt;</span></div>
<div class="line"><a id="l00033" name="l00033"></a><span class="lineno">   33</span><span class="comment">        /// Types of inter-frame compression.</span></div>
<div class="line"><a id="l00034" name="l00034"></a><span class="lineno">   34</span><span class="comment">        /// &lt;/summary&gt;</span></div>
<div class="line"><a id="l00035" name="l00035"></a><span class="lineno"><a class="line" href="class_vect_sharp_1_1_animated_p_n_g.html#ac87e8fb45a427615d2645ba751e5d09a">   35</a></span><span class="comment"></span>        <span class="keyword">public</span> <span class="keyword">enum</span> <a class="code hl_enumeration" href="class_vect_sharp_1_1_animated_p_n_g.html#ac87e8fb45a427615d2645ba751e5d09a">InterframeCompression</a></div>
<div class="line"><a id="l00036" name="l00036"></a><span class="lineno">   36</span>        {<span class="comment"></span></div>
<div class="line"><a id="l00037" name="l00037"></a><span class="lineno">   37</span><span class="comment">            /// &lt;summary&gt;</span></div>
<div class="line"><a id="l00038" name="l00038"></a><span class="lineno">   38</span><span class="comment">            /// No inter-frame compression is performed (fastest, but produces the largest files).</span></div>
<div class="line"><a id="l00039" name="l00039"></a><span class="lineno">   39</span><span class="comment">            /// &lt;/summary&gt;</span></div>
<div class="line"><a id="l00040" name="l00040"></a><span class="lineno">   40</span><span class="comment"></span>            None,</div>
<div class="line"><a id="l00041" name="l00041"></a><span class="lineno">   41</span><span class="comment"></span> </div>
<div class="line"><a id="l00042" name="l00042"></a><span class="lineno">   42</span><span class="comment">            /// &lt;summary&gt;</span></div>
<div class="line"><a id="l00043" name="l00043"></a><span class="lineno">   43</span><span class="comment">            /// Inter-frame compression is performed by encoding the difference between each frame and the first frame in the animation.</span></div>
<div class="line"><a id="l00044" name="l00044"></a><span class="lineno">   44</span><span class="comment">            /// &lt;/summary&gt;</span></div>
<div class="line"><a id="l00045" name="l00045"></a><span class="lineno">   45</span><span class="comment"></span>            First,</div>
<div class="line"><a id="l00046" name="l00046"></a><span class="lineno">   46</span><span class="comment"></span> </div>
<div class="line"><a id="l00047" name="l00047"></a><span class="lineno">   47</span><span class="comment">            /// &lt;summary&gt;</span></div>
<div class="line"><a id="l00048" name="l00048"></a><span class="lineno">   48</span><span class="comment">            /// Inter-frame compression is performed by encoding the difference between each frame and the previous frame (produces the smallest files, but it is the slowest and requires large amounts of memory).</span></div>
<div class="line"><a id="l00049" name="l00049"></a><span class="lineno">   49</span><span class="comment">            /// &lt;/summary&gt;</span></div>
<div class="line"><a id="l00050" name="l00050"></a><span class="lineno">   50</span><span class="comment"></span>            Previous</div>
<div class="line"><a id="l00051" name="l00051"></a><span class="lineno">   51</span>        }</div>
<div class="line"><a id="l00052" name="l00052"></a><span class="lineno">   52</span><span class="comment"></span> </div>
<div class="line"><a id="l00053" name="l00053"></a><span class="lineno">   53</span><span class="comment">        /// &lt;summary&gt;</span></div>
<div class="line"><a id="l00054" name="l00054"></a><span class="lineno">   54</span><span class="comment">        /// Represents an individual frame of a PNG animation.</span></div>
<div class="line"><a id="l00055" name="l00055"></a><span class="lineno">   55</span><span class="comment">        /// &lt;/summary&gt;</span></div>
<div class="line"><a id="l00056" name="l00056"></a><span class="lineno"><a class="line" href="class_vect_sharp_1_1_animated_p_n_g_1_1_compressed_frame.html">   56</a></span><span class="comment"></span>        <span class="keyword">public</span> <span class="keyword">class </span><a class="code hl_class" href="class_vect_sharp_1_1_animated_p_n_g_1_1_compressed_frame.html">CompressedFrame</a> : IDisposable</div>
<div class="line"><a id="l00057" name="l00057"></a><span class="lineno">   57</span>        {</div>
<div class="line"><a id="l00058" name="l00058"></a><span class="lineno">   58</span>            <span class="keyword">internal</span> MemoryStream compressedStream;</div>
<div class="line"><a id="l00059" name="l00059"></a><span class="lineno">   59</span>            <span class="keyword">private</span> <span class="keywordtype">bool</span> disposedValue;</div>
<div class="line"><a id="l00060" name="l00060"></a><span class="lineno">   60</span><span class="comment"></span> </div>
<div class="line"><a id="l00061" name="l00061"></a><span class="lineno">   61</span><span class="comment">            /// &lt;summary&gt;</span></div>
<div class="line"><a id="l00062" name="l00062"></a><span class="lineno">   62</span><span class="comment">            /// The duration of the frame in milliseconds.</span></div>
<div class="line"><a id="l00063" name="l00063"></a><span class="lineno">   63</span><span class="comment">            /// &lt;/summary&gt;</span></div>
<div class="line"><a id="l00064" name="l00064"></a><span class="lineno"><a class="line" href="class_vect_sharp_1_1_animated_p_n_g_1_1_compressed_frame.html#a424da0e063955f0d19ecc46d51331b04">   64</a></span><span class="comment"></span>            <span class="keyword">public</span> <span class="keywordtype">double</span> <a class="code hl_property" href="class_vect_sharp_1_1_animated_p_n_g_1_1_compressed_frame.html#a424da0e063955f0d19ecc46d51331b04">Duration</a> { <span class="keyword">get</span>; }</div>
<div class="line"><a id="l00065" name="l00065"></a><span class="lineno">   65</span> </div>
<div class="line"><a id="l00066" name="l00066"></a><span class="lineno">   66</span>            <span class="keyword">internal</span> <a class="code hl_enumeration" href="class_vect_sharp_1_1_animated_p_n_g.html#ac87e8fb45a427615d2645ba751e5d09a">InterframeCompression</a> <a class="code hl_enumeration" href="class_vect_sharp_1_1_animated_p_n_g.html#ac87e8fb45a427615d2645ba751e5d09a">InterframeCompression</a> { <span class="keyword">get</span>; } = InterframeCompression.None;</div>
<div class="line"><a id="l00067" name="l00067"></a><span class="lineno">   67</span><span class="comment"></span> </div>
<div class="line"><a id="l00068" name="l00068"></a><span class="lineno">   68</span><span class="comment">            /// &lt;summary&gt;</span></div>
<div class="line"><a id="l00069" name="l00069"></a><span class="lineno">   69</span><span class="comment">            /// Creates a new &lt;see cref=&quot;CompressedFrame&quot;/&gt; from raw pixel data in RGB or RGBA format.</span></div>
<div class="line"><a id="l00070" name="l00070"></a><span class="lineno">   70</span><span class="comment">            /// &lt;/summary&gt;</span></div>
<div class="line"><a id="l00071" name="l00071"></a><span class="lineno">   71</span><span class="comment">            /// &lt;param name=&quot;rawFrameData&quot;&gt;A pointer to the raw pixel data for the frame.&lt;/param&gt;</span></div>
<div class="line"><a id="l00072" name="l00072"></a><span class="lineno">   72</span><span class="comment">            /// &lt;param name=&quot;width&quot;&gt;The width of the image in pixels.&lt;/param&gt;</span></div>
<div class="line"><a id="l00073" name="l00073"></a><span class="lineno">   73</span><span class="comment">            /// &lt;param name=&quot;height&quot;&gt;The height of the image in pixels.&lt;/param&gt;</span></div>
<div class="line"><a id="l00074" name="l00074"></a><span class="lineno">   74</span><span class="comment">            /// &lt;param name=&quot;hasAlpha&quot;&gt;If the image data is in RGBA format, set this to &lt;see langword=&quot;true&quot;/&gt;; if it is in RGB format, set it to &lt;see langword=&quot;false&quot;/&gt;.&lt;/param&gt;</span></div>
<div class="line"><a id="l00075" name="l00075"></a><span class="lineno">   75</span><span class="comment">            /// &lt;param name=&quot;duration&quot;&gt;The duration of the frame in milliseconds.&lt;/param&gt;</span></div>
<div class="line"><a id="l00076" name="l00076"></a><span class="lineno"><a class="line" href="class_vect_sharp_1_1_animated_p_n_g_1_1_compressed_frame.html#a55ad3c2d0f0e2e5b8b1110d2a7be2ff0">   76</a></span><span class="comment"></span>            <span class="keyword">public</span> unsafe <a class="code hl_function" href="class_vect_sharp_1_1_animated_p_n_g_1_1_compressed_frame.html#a55ad3c2d0f0e2e5b8b1110d2a7be2ff0">CompressedFrame</a>(<a class="code hl_class" href="class_vect_sharp_1_1_disposable_int_ptr.html">DisposableIntPtr</a> rawFrameData, <span class="keywordtype">int</span> width, <span class="keywordtype">int</span> height, <span class="keywordtype">bool</span> hasAlpha, <span class="keywordtype">double</span> duration)</div>
<div class="line"><a id="l00077" name="l00077"></a><span class="lineno">   77</span>            {</div>
<div class="line"><a id="l00078" name="l00078"></a><span class="lineno">   78</span>                this.compressedStream = PNGEncoder.CompressAPNGFrame((<span class="keywordtype">byte</span>*)rawFrameData.<a class="code hl_variable" href="class_vect_sharp_1_1_disposable_int_ptr.html#a302f3352139ebeac272a6e212503ba5b">InternalPointer</a>, width, height, hasAlpha, PNGEncoder.FilterModes.Adaptive, 1);</div>
<div class="line"><a id="l00079" name="l00079"></a><span class="lineno">   79</span>                this.Duration = duration;</div>
<div class="line"><a id="l00080" name="l00080"></a><span class="lineno">   80</span>                this.InterframeCompression = <a class="code hl_enumeration" href="class_vect_sharp_1_1_animated_p_n_g.html#ac87e8fb45a427615d2645ba751e5d09a">InterframeCompression</a>.None;</div>
<div class="line"><a id="l00081" name="l00081"></a><span class="lineno">   81</span>            }</div>
<div class="line"><a id="l00082" name="l00082"></a><span class="lineno">   82</span><span class="comment"></span> </div>
<div class="line"><a id="l00083" name="l00083"></a><span class="lineno">   83</span><span class="comment">            /// &lt;summary&gt;</span></div>
<div class="line"><a id="l00084" name="l00084"></a><span class="lineno">   84</span><span class="comment">            /// Creates a new &lt;see cref=&quot;CompressedFrame&quot;/&gt; from raw pixel data in RGB or RGBA format, applying inter-frame compression based on another frame.</span></div>
<div class="line"><a id="l00085" name="l00085"></a><span class="lineno">   85</span><span class="comment">            /// &lt;/summary&gt;</span></div>
<div class="line"><a id="l00086" name="l00086"></a><span class="lineno">   86</span><span class="comment">            /// &lt;param name=&quot;rawFrameData&quot;&gt;A pointer to the raw pixel data for the new frame.&lt;/param&gt;</span></div>
<div class="line"><a id="l00087" name="l00087"></a><span class="lineno">   87</span><span class="comment">            /// &lt;param name=&quot;otherFrameData&quot;&gt;A pointer to the raw pixel data for the frame to use as a reference. This can either be the first frame in the animation, or the frame immediately preceeding the current frame.&lt;/param&gt;</span></div>
<div class="line"><a id="l00088" name="l00088"></a><span class="lineno">   88</span><span class="comment">            /// &lt;param name=&quot;isFirstFrame&quot;&gt;If &lt;paramref name=&quot;otherFrameData&quot;/&gt; is the raw pixel data for the first frame in the animation, set this to &lt;see langword=&quot;true&quot;/&gt;; if it is the immediately preceeding frame, set this to &lt;see langword=&quot;false&quot;/&gt;.&lt;/param&gt;</span></div>
<div class="line"><a id="l00089" name="l00089"></a><span class="lineno">   89</span><span class="comment">            /// &lt;param name=&quot;width&quot;&gt;The width of the image in pixels.&lt;/param&gt;</span></div>
<div class="line"><a id="l00090" name="l00090"></a><span class="lineno">   90</span><span class="comment">            /// &lt;param name=&quot;height&quot;&gt;The height of the image in pixels.&lt;/param&gt;</span></div>
<div class="line"><a id="l00091" name="l00091"></a><span class="lineno">   91</span><span class="comment">            /// &lt;param name=&quot;hasAlpha&quot;&gt;If the image data is in RGBA format, set this to &lt;see langword=&quot;true&quot;/&gt;; if it is in RGB format, set it to &lt;see langword=&quot;false&quot;/&gt;.&lt;/param&gt;</span></div>
<div class="line"><a id="l00092" name="l00092"></a><span class="lineno">   92</span><span class="comment">            /// &lt;param name=&quot;duration&quot;&gt;The duration of the frame in milliseconds.&lt;/param&gt;</span></div>
<div class="line"><a id="l00093" name="l00093"></a><span class="lineno"><a class="line" href="class_vect_sharp_1_1_animated_p_n_g_1_1_compressed_frame.html#aeb21a7f80af6b57029f09cdeb3cedeec">   93</a></span><span class="comment"></span>            <span class="keyword">public</span> unsafe <a class="code hl_function" href="class_vect_sharp_1_1_animated_p_n_g_1_1_compressed_frame.html#aeb21a7f80af6b57029f09cdeb3cedeec">CompressedFrame</a>(<a class="code hl_class" href="class_vect_sharp_1_1_disposable_int_ptr.html">DisposableIntPtr</a> rawFrameData, <a class="code hl_class" href="class_vect_sharp_1_1_disposable_int_ptr.html">DisposableIntPtr</a> otherFrameData, <span class="keywordtype">bool</span> isFirstFrame, <span class="keywordtype">int</span> width, <span class="keywordtype">int</span> height, <span class="keywordtype">bool</span> hasAlpha, <span class="keywordtype">double</span> duration)</div>
<div class="line"><a id="l00094" name="l00094"></a><span class="lineno">   94</span>            {</div>
<div class="line"><a id="l00095" name="l00095"></a><span class="lineno">   95</span>                <span class="keywordtype">int</span> pixelSize = hasAlpha ? 4 : 3;</div>
<div class="line"><a id="l00096" name="l00096"></a><span class="lineno">   96</span> </div>
<div class="line"><a id="l00097" name="l00097"></a><span class="lineno">   97</span>                IntPtr frameDiff = Marshal.AllocHGlobal(width * height * 4);</div>
<div class="line"><a id="l00098" name="l00098"></a><span class="lineno">   98</span> </div>
<div class="line"><a id="l00099" name="l00099"></a><span class="lineno">   99</span>                <span class="keywordtype">byte</span>* frameDiffData = (<span class="keywordtype">byte</span>*)frameDiff;</div>
<div class="line"><a id="l00100" name="l00100"></a><span class="lineno">  100</span>                <span class="keywordtype">byte</span>* previousFrame = (<span class="keywordtype">byte</span>*)otherFrameData.<a class="code hl_variable" href="class_vect_sharp_1_1_disposable_int_ptr.html#a302f3352139ebeac272a6e212503ba5b">InternalPointer</a>;</div>
<div class="line"><a id="l00101" name="l00101"></a><span class="lineno">  101</span>                <span class="keywordtype">byte</span>* currentFrame = (<span class="keywordtype">byte</span>*)rawFrameData.<a class="code hl_variable" href="class_vect_sharp_1_1_disposable_int_ptr.html#a302f3352139ebeac272a6e212503ba5b">InternalPointer</a>;</div>
<div class="line"><a id="l00102" name="l00102"></a><span class="lineno">  102</span> </div>
<div class="line"><a id="l00103" name="l00103"></a><span class="lineno">  103</span>                <span class="keywordflow">for</span> (<span class="keywordtype">int</span> y = 0; y &lt; height; y++)</div>
<div class="line"><a id="l00104" name="l00104"></a><span class="lineno">  104</span>                {</div>
<div class="line"><a id="l00105" name="l00105"></a><span class="lineno">  105</span>                    <span class="keywordflow">for</span> (<span class="keywordtype">int</span> x = 0; x &lt; width; x++)</div>
<div class="line"><a id="l00106" name="l00106"></a><span class="lineno">  106</span>                    {</div>
<div class="line"><a id="l00107" name="l00107"></a><span class="lineno">  107</span>                        <span class="keywordtype">int</span> pixelIndex = (y * width + x) * pixelSize;</div>
<div class="line"><a id="l00108" name="l00108"></a><span class="lineno">  108</span> </div>
<div class="line"><a id="l00109" name="l00109"></a><span class="lineno">  109</span>                        <span class="keywordflow">if</span> (previousFrame[pixelIndex] != currentFrame[pixelIndex] || previousFrame[pixelIndex + 1] != currentFrame[pixelIndex + 1] ||</div>
<div class="line"><a id="l00110" name="l00110"></a><span class="lineno">  110</span>                            previousFrame[pixelIndex + 2] != currentFrame[pixelIndex + 2] || (hasAlpha &amp;&amp; previousFrame[pixelIndex + 3] != currentFrame[pixelIndex + 3]))</div>
<div class="line"><a id="l00111" name="l00111"></a><span class="lineno">  111</span>                        {</div>
<div class="line"><a id="l00112" name="l00112"></a><span class="lineno">  112</span>                            frameDiffData[pixelIndex] = currentFrame[pixelIndex];</div>
<div class="line"><a id="l00113" name="l00113"></a><span class="lineno">  113</span>                            frameDiffData[pixelIndex + 1] = currentFrame[pixelIndex + 1];</div>
<div class="line"><a id="l00114" name="l00114"></a><span class="lineno">  114</span>                            frameDiffData[pixelIndex + 2] = currentFrame[pixelIndex + 2];</div>
<div class="line"><a id="l00115" name="l00115"></a><span class="lineno">  115</span> </div>
<div class="line"><a id="l00116" name="l00116"></a><span class="lineno">  116</span>                            <span class="keywordflow">if</span> (hasAlpha)</div>
<div class="line"><a id="l00117" name="l00117"></a><span class="lineno">  117</span>                            {</div>
<div class="line"><a id="l00118" name="l00118"></a><span class="lineno">  118</span>                                frameDiffData[pixelIndex + 3] = currentFrame[pixelIndex + 3];</div>
<div class="line"><a id="l00119" name="l00119"></a><span class="lineno">  119</span>                            }</div>
<div class="line"><a id="l00120" name="l00120"></a><span class="lineno">  120</span>                            <span class="keywordflow">else</span></div>
<div class="line"><a id="l00121" name="l00121"></a><span class="lineno">  121</span>                            {</div>
<div class="line"><a id="l00122" name="l00122"></a><span class="lineno">  122</span>                                frameDiffData[pixelIndex + 3] = 255;</div>
<div class="line"><a id="l00123" name="l00123"></a><span class="lineno">  123</span>                            }</div>
<div class="line"><a id="l00124" name="l00124"></a><span class="lineno">  124</span>                        }</div>
<div class="line"><a id="l00125" name="l00125"></a><span class="lineno">  125</span>                        <span class="keywordflow">else</span></div>
<div class="line"><a id="l00126" name="l00126"></a><span class="lineno">  126</span>                        {</div>
<div class="line"><a id="l00127" name="l00127"></a><span class="lineno">  127</span>                            frameDiffData[pixelIndex] = 0;</div>
<div class="line"><a id="l00128" name="l00128"></a><span class="lineno">  128</span>                            frameDiffData[pixelIndex + 1] = 0;</div>
<div class="line"><a id="l00129" name="l00129"></a><span class="lineno">  129</span>                            frameDiffData[pixelIndex + 2] = 0;</div>
<div class="line"><a id="l00130" name="l00130"></a><span class="lineno">  130</span>                            frameDiffData[pixelIndex + 3] = 0;</div>
<div class="line"><a id="l00131" name="l00131"></a><span class="lineno">  131</span>                        }</div>
<div class="line"><a id="l00132" name="l00132"></a><span class="lineno">  132</span>                    }</div>
<div class="line"><a id="l00133" name="l00133"></a><span class="lineno">  133</span>                }</div>
<div class="line"><a id="l00134" name="l00134"></a><span class="lineno">  134</span> </div>
<div class="line"><a id="l00135" name="l00135"></a><span class="lineno">  135</span>                this.compressedStream = PNGEncoder.CompressAPNGFrame((<span class="keywordtype">byte</span>*)frameDiff, width, height, <span class="keyword">true</span>, PNGEncoder.FilterModes.Adaptive, 1);</div>
<div class="line"><a id="l00136" name="l00136"></a><span class="lineno">  136</span>                this.Duration = duration;</div>
<div class="line"><a id="l00137" name="l00137"></a><span class="lineno">  137</span> </div>
<div class="line"><a id="l00138" name="l00138"></a><span class="lineno">  138</span>                <span class="keywordflow">if</span> (isFirstFrame)</div>
<div class="line"><a id="l00139" name="l00139"></a><span class="lineno">  139</span>                {</div>
<div class="line"><a id="l00140" name="l00140"></a><span class="lineno">  140</span>                    this.InterframeCompression = <a class="code hl_enumeration" href="class_vect_sharp_1_1_animated_p_n_g.html#ac87e8fb45a427615d2645ba751e5d09a">InterframeCompression</a>.First;</div>
<div class="line"><a id="l00141" name="l00141"></a><span class="lineno">  141</span>                }</div>
<div class="line"><a id="l00142" name="l00142"></a><span class="lineno">  142</span>                <span class="keywordflow">else</span></div>
<div class="line"><a id="l00143" name="l00143"></a><span class="lineno">  143</span>                {</div>
<div class="line"><a id="l00144" name="l00144"></a><span class="lineno">  144</span>                    this.InterframeCompression = <a class="code hl_enumeration" href="class_vect_sharp_1_1_animated_p_n_g.html#ac87e8fb45a427615d2645ba751e5d09a">InterframeCompression</a>.Previous;</div>
<div class="line"><a id="l00145" name="l00145"></a><span class="lineno">  145</span>                }</div>
<div class="line"><a id="l00146" name="l00146"></a><span class="lineno">  146</span> </div>
<div class="line"><a id="l00147" name="l00147"></a><span class="lineno">  147</span>                Marshal.FreeHGlobal(frameDiff);</div>
<div class="line"><a id="l00148" name="l00148"></a><span class="lineno">  148</span>            }</div>
<div class="line"><a id="l00149" name="l00149"></a><span class="lineno">  149</span><span class="comment"></span> </div>
<div class="line"><a id="l00150" name="l00150"></a><span class="lineno">  150</span><span class="comment">            /// &lt;inheritdoc/&gt;</span></div>
<div class="line"><a id="l00151" name="l00151"></a><span class="lineno">  151</span><span class="comment"></span>            <span class="keyword">protected</span> <span class="keyword">virtual</span> <span class="keywordtype">void</span> <a class="code hl_function" href="class_vect_sharp_1_1_animated_p_n_g_1_1_compressed_frame.html#a8802f282ddd41df64174f00d1e4b3600">Dispose</a>(<span class="keywordtype">bool</span> disposing)</div>
<div class="line"><a id="l00152" name="l00152"></a><span class="lineno">  152</span>            {</div>
<div class="line"><a id="l00153" name="l00153"></a><span class="lineno">  153</span>                <span class="keywordflow">if</span> (!disposedValue)</div>
<div class="line"><a id="l00154" name="l00154"></a><span class="lineno">  154</span>                {</div>
<div class="line"><a id="l00155" name="l00155"></a><span class="lineno">  155</span>                    <span class="keywordflow">if</span> (disposing)</div>
<div class="line"><a id="l00156" name="l00156"></a><span class="lineno">  156</span>                    {</div>
<div class="line"><a id="l00157" name="l00157"></a><span class="lineno">  157</span>                        this.compressedStream.Dispose();</div>
<div class="line"><a id="l00158" name="l00158"></a><span class="lineno">  158</span>                    }</div>
<div class="line"><a id="l00159" name="l00159"></a><span class="lineno">  159</span> </div>
<div class="line"><a id="l00160" name="l00160"></a><span class="lineno">  160</span>                    disposedValue = <span class="keyword">true</span>;</div>
<div class="line"><a id="l00161" name="l00161"></a><span class="lineno">  161</span>                }</div>
<div class="line"><a id="l00162" name="l00162"></a><span class="lineno">  162</span>            }</div>
<div class="line"><a id="l00163" name="l00163"></a><span class="lineno">  163</span><span class="comment"></span> </div>
<div class="line"><a id="l00164" name="l00164"></a><span class="lineno">  164</span><span class="comment">            /// &lt;inheritdoc/&gt;</span></div>
<div class="line"><a id="l00165" name="l00165"></a><span class="lineno"><a class="line" href="class_vect_sharp_1_1_animated_p_n_g_1_1_compressed_frame.html#a8802f282ddd41df64174f00d1e4b3600">  165</a></span><span class="comment"></span>            <span class="keyword">public</span> <span class="keywordtype">void</span> <a class="code hl_function" href="class_vect_sharp_1_1_animated_p_n_g_1_1_compressed_frame.html#a8802f282ddd41df64174f00d1e4b3600">Dispose</a>()</div>
<div class="line"><a id="l00166" name="l00166"></a><span class="lineno">  166</span>            {</div>
<div class="line"><a id="l00167" name="l00167"></a><span class="lineno">  167</span>                <a class="code hl_function" href="class_vect_sharp_1_1_animated_p_n_g_1_1_compressed_frame.html#a8802f282ddd41df64174f00d1e4b3600">Dispose</a>(disposing: <span class="keyword">true</span>);</div>
<div class="line"><a id="l00168" name="l00168"></a><span class="lineno">  168</span>                GC.SuppressFinalize(<span class="keyword">this</span>);</div>
<div class="line"><a id="l00169" name="l00169"></a><span class="lineno">  169</span>            }</div>
<div class="line"><a id="l00170" name="l00170"></a><span class="lineno">  170</span>        }</div>
<div class="line"><a id="l00171" name="l00171"></a><span class="lineno">  171</span><span class="comment"></span> </div>
<div class="line"><a id="l00172" name="l00172"></a><span class="lineno">  172</span><span class="comment">        /// &lt;summary&gt;</span></div>
<div class="line"><a id="l00173" name="l00173"></a><span class="lineno">  173</span><span class="comment">        /// Create a new animated PNG image, outputting it to the specified stream.</span></div>
<div class="line"><a id="l00174" name="l00174"></a><span class="lineno">  174</span><span class="comment">        /// &lt;/summary&gt;</span></div>
<div class="line"><a id="l00175" name="l00175"></a><span class="lineno">  175</span><span class="comment">        /// &lt;param name=&quot;outputStream&quot;&gt;The stream to which the animated PNG image will be written.&lt;/param&gt;</span></div>
<div class="line"><a id="l00176" name="l00176"></a><span class="lineno">  176</span><span class="comment">        /// &lt;param name=&quot;width&quot;&gt;The width of the image in pixels.&lt;/param&gt;</span></div>
<div class="line"><a id="l00177" name="l00177"></a><span class="lineno">  177</span><span class="comment">        /// &lt;param name=&quot;height&quot;&gt;The height of the image in pixels.&lt;/param&gt;</span></div>
<div class="line"><a id="l00178" name="l00178"></a><span class="lineno">  178</span><span class="comment">        /// &lt;param name=&quot;hasAlpha&quot;&gt;If the frames of the image have an alpha channel, set this to &lt;see langword=&quot;true&quot;/&gt;; otherwise, set it to &lt;see langword=&quot;false&quot;/&gt;.&lt;/param&gt;</span></div>
<div class="line"><a id="l00179" name="l00179"></a><span class="lineno">  179</span><span class="comment">        /// &lt;param name=&quot;compressedFrames&quot;&gt;The frames that will be used to create the animated PNG image.&lt;/param&gt;</span></div>
<div class="line"><a id="l00180" name="l00180"></a><span class="lineno">  180</span><span class="comment">        /// &lt;param name=&quot;repeatCount&quot;&gt;The number of times that the animation should loop. Set this to 0 for an infinitely repeating animation.&lt;/param&gt;</span></div>
<div class="line"><a id="l00181" name="l00181"></a><span class="lineno"><a class="line" href="class_vect_sharp_1_1_animated_p_n_g.html#a56613107ced2d0c6322fa834270c00b5">  181</a></span><span class="comment"></span>        <span class="keyword">public</span> <span class="keyword">static</span> unsafe <span class="keywordtype">void</span> <a class="code hl_function" href="class_vect_sharp_1_1_animated_p_n_g.html#a56613107ced2d0c6322fa834270c00b5">Create</a>(Stream outputStream, <span class="keywordtype">int</span> width, <span class="keywordtype">int</span> height, <span class="keywordtype">bool</span> hasAlpha, IReadOnlyList&lt;CompressedFrame&gt; compressedFrames, <span class="keywordtype">int</span> repeatCount)</div>
<div class="line"><a id="l00182" name="l00182"></a><span class="lineno">  182</span>        {</div>
<div class="line"><a id="l00183" name="l00183"></a><span class="lineno">  183</span>            PNGEncoder.StartAPNG(width, height, hasAlpha, outputStream, compressedFrames.Count, repeatCount);</div>
<div class="line"><a id="l00184" name="l00184"></a><span class="lineno">  184</span> </div>
<div class="line"><a id="l00185" name="l00185"></a><span class="lineno">  185</span>            <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i &lt; compressedFrames.Count; i++)</div>
<div class="line"><a id="l00186" name="l00186"></a><span class="lineno">  186</span>            {</div>
<div class="line"><a id="l00187" name="l00187"></a><span class="lineno">  187</span>                ushort frameDurationNumerator = (ushort)Math.Round(compressedFrames[i].Duration * 60);</div>
<div class="line"><a id="l00188" name="l00188"></a><span class="lineno">  188</span>                ushort frameDurationDenominator = 60000;</div>
<div class="line"><a id="l00189" name="l00189"></a><span class="lineno">  189</span>                PNGEncoder.AddPreCompressedAPNGFrame(compressedFrames[i], width, height, hasAlpha, outputStream, i, frameDurationNumerator, frameDurationDenominator);</div>
<div class="line"><a id="l00190" name="l00190"></a><span class="lineno">  190</span>            }</div>
<div class="line"><a id="l00191" name="l00191"></a><span class="lineno">  191</span> </div>
<div class="line"><a id="l00192" name="l00192"></a><span class="lineno">  192</span>            PNGEncoder.FinishAPNG(outputStream);</div>
<div class="line"><a id="l00193" name="l00193"></a><span class="lineno">  193</span>        }</div>
<div class="line"><a id="l00194" name="l00194"></a><span class="lineno">  194</span>    }</div>
<div class="line"><a id="l00195" name="l00195"></a><span class="lineno">  195</span> </div>
<div class="line"><a id="l00196" name="l00196"></a><span class="lineno">  196</span> </div>
<div class="line"><a id="l00197" name="l00197"></a><span class="lineno">  197</span> </div>
<div class="line"><a id="l00198" name="l00198"></a><span class="lineno">  198</span>    <span class="keyword">internal</span> <span class="keyword">static</span> <span class="keyword">class </span>PNGEncoder</div>
<div class="line"><a id="l00199" name="l00199"></a><span class="lineno">  199</span>    {</div>
<div class="line"><a id="l00200" name="l00200"></a><span class="lineno">  200</span>        <span class="keyword">internal</span> unsafe <span class="keyword">static</span> <span class="keywordtype">void</span> SavePNG(<span class="keywordtype">byte</span>* image, <span class="keywordtype">int</span> width, <span class="keywordtype">int</span> height, <span class="keywordtype">bool</span> hasAlpha, Stream fs, FilterModes filter, <span class="keywordtype">int</span> threadCount = 0)</div>
<div class="line"><a id="l00201" name="l00201"></a><span class="lineno">  201</span>        {</div>
<div class="line"><a id="l00202" name="l00202"></a><span class="lineno">  202</span>            <span class="keywordflow">if</span> (threadCount == 0)</div>
<div class="line"><a id="l00203" name="l00203"></a><span class="lineno">  203</span>            {</div>
<div class="line"><a id="l00204" name="l00204"></a><span class="lineno">  204</span>                threadCount = filter == FilterModes.Adaptive ? Math.Max(1, Math.Min(width / 600, Environment.ProcessorCount - 2)) : 1;</div>
<div class="line"><a id="l00205" name="l00205"></a><span class="lineno">  205</span>            }</div>
<div class="line"><a id="l00206" name="l00206"></a><span class="lineno">  206</span> </div>
<div class="line"><a id="l00207" name="l00207"></a><span class="lineno">  207</span>            <span class="comment">//Header</span></div>
<div class="line"><a id="l00208" name="l00208"></a><span class="lineno">  208</span>            fs.Write(<span class="keyword">new</span> <span class="keywordtype">byte</span>[] { 0x89, 0x50, 0x4E, 0x47, 0x0D, 0x0A, 0x1A, 0x0A }, 0, 8);</div>
<div class="line"><a id="l00209" name="l00209"></a><span class="lineno">  209</span> </div>
<div class="line"><a id="l00210" name="l00210"></a><span class="lineno">  210</span>            <span class="comment">//IHDR chunk</span></div>
<div class="line"><a id="l00211" name="l00211"></a><span class="lineno">  211</span>            fs.WriteInt(13);</div>
<div class="line"><a id="l00212" name="l00212"></a><span class="lineno">  212</span>            <span class="keyword">using</span> (MemoryStream ihdr = <span class="keyword">new</span> MemoryStream(13))</div>
<div class="line"><a id="l00213" name="l00213"></a><span class="lineno">  213</span>            {</div>
<div class="line"><a id="l00214" name="l00214"></a><span class="lineno">  214</span>                ihdr.WriteASCIIString(<span class="stringliteral">&quot;IHDR&quot;</span>);</div>
<div class="line"><a id="l00215" name="l00215"></a><span class="lineno">  215</span>                ihdr.WriteInt(width);</div>
<div class="line"><a id="l00216" name="l00216"></a><span class="lineno">  216</span>                ihdr.WriteInt(height);</div>
<div class="line"><a id="l00217" name="l00217"></a><span class="lineno">  217</span>                ihdr.WriteByte(8); <span class="comment">//Bit depth</span></div>
<div class="line"><a id="l00218" name="l00218"></a><span class="lineno">  218</span> </div>
<div class="line"><a id="l00219" name="l00219"></a><span class="lineno">  219</span>                <span class="keywordflow">if</span> (hasAlpha)</div>
<div class="line"><a id="l00220" name="l00220"></a><span class="lineno">  220</span>                {</div>
<div class="line"><a id="l00221" name="l00221"></a><span class="lineno">  221</span>                    ihdr.WriteByte(6); <span class="comment">//Colour type</span></div>
<div class="line"><a id="l00222" name="l00222"></a><span class="lineno">  222</span>                }</div>
<div class="line"><a id="l00223" name="l00223"></a><span class="lineno">  223</span>                <span class="keywordflow">else</span></div>
<div class="line"><a id="l00224" name="l00224"></a><span class="lineno">  224</span>                {</div>
<div class="line"><a id="l00225" name="l00225"></a><span class="lineno">  225</span>                    ihdr.WriteByte(2); <span class="comment">//Colour type</span></div>
<div class="line"><a id="l00226" name="l00226"></a><span class="lineno">  226</span>                }</div>
<div class="line"><a id="l00227" name="l00227"></a><span class="lineno">  227</span> </div>
<div class="line"><a id="l00228" name="l00228"></a><span class="lineno">  228</span>                ihdr.WriteByte(0); <span class="comment">//Compression method</span></div>
<div class="line"><a id="l00229" name="l00229"></a><span class="lineno">  229</span>                ihdr.WriteByte(0); <span class="comment">//Filter method</span></div>
<div class="line"><a id="l00230" name="l00230"></a><span class="lineno">  230</span>                ihdr.WriteByte(0); <span class="comment">//Interlace</span></div>
<div class="line"><a id="l00231" name="l00231"></a><span class="lineno">  231</span> </div>
<div class="line"><a id="l00232" name="l00232"></a><span class="lineno">  232</span>                ihdr.Seek(0, SeekOrigin.Begin);</div>
<div class="line"><a id="l00233" name="l00233"></a><span class="lineno">  233</span>                ihdr.CopyTo(fs);</div>
<div class="line"><a id="l00234" name="l00234"></a><span class="lineno">  234</span> </div>
<div class="line"><a id="l00235" name="l00235"></a><span class="lineno">  235</span>                fs.WriteUInt(CRC32.ComputeCRC(ihdr));</div>
<div class="line"><a id="l00236" name="l00236"></a><span class="lineno">  236</span>            }</div>
<div class="line"><a id="l00237" name="l00237"></a><span class="lineno">  237</span> </div>
<div class="line"><a id="l00238" name="l00238"></a><span class="lineno">  238</span>            <span class="comment">//IDAT chunk</span></div>
<div class="line"><a id="l00239" name="l00239"></a><span class="lineno">  239</span>            IntPtr filteredImage;</div>
<div class="line"><a id="l00240" name="l00240"></a><span class="lineno">  240</span> </div>
<div class="line"><a id="l00241" name="l00241"></a><span class="lineno">  241</span>            <span class="keywordflow">if</span> (threadCount &gt; 1)</div>
<div class="line"><a id="l00242" name="l00242"></a><span class="lineno">  242</span>            {</div>
<div class="line"><a id="l00243" name="l00243"></a><span class="lineno">  243</span>                filteredImage = FilterImageData(image, width, height, hasAlpha ? 4 : 3, filter, threadCount);</div>
<div class="line"><a id="l00244" name="l00244"></a><span class="lineno">  244</span>            }</div>
<div class="line"><a id="l00245" name="l00245"></a><span class="lineno">  245</span>            <span class="keywordflow">else</span></div>
<div class="line"><a id="l00246" name="l00246"></a><span class="lineno">  246</span>            {</div>
<div class="line"><a id="l00247" name="l00247"></a><span class="lineno">  247</span>                filteredImage = FilterImageData(image, width, height, hasAlpha ? 4 : 3, filter);</div>
<div class="line"><a id="l00248" name="l00248"></a><span class="lineno">  248</span>            }</div>
<div class="line"><a id="l00249" name="l00249"></a><span class="lineno">  249</span> </div>
<div class="line"><a id="l00250" name="l00250"></a><span class="lineno">  250</span>            <span class="keyword">using</span> (MemoryStream compressedImage = StreamUtils.ZLibCompress(filteredImage, height * (width * (hasAlpha ? 4 : 3) + 1)))</div>
<div class="line"><a id="l00251" name="l00251"></a><span class="lineno">  251</span>            {</div>
<div class="line"><a id="l00252" name="l00252"></a><span class="lineno">  252</span>                compressedImage.Seek(0, SeekOrigin.Begin);</div>
<div class="line"><a id="l00253" name="l00253"></a><span class="lineno">  253</span>                fs.WriteUInt((uint)compressedImage.Length);</div>
<div class="line"><a id="l00254" name="l00254"></a><span class="lineno">  254</span>                fs.WriteASCIIString(<span class="stringliteral">&quot;IDAT&quot;</span>);</div>
<div class="line"><a id="l00255" name="l00255"></a><span class="lineno">  255</span>                compressedImage.Seek(0, SeekOrigin.Begin);</div>
<div class="line"><a id="l00256" name="l00256"></a><span class="lineno">  256</span>                compressedImage.CopyTo(fs);</div>
<div class="line"><a id="l00257" name="l00257"></a><span class="lineno">  257</span> </div>
<div class="line"><a id="l00258" name="l00258"></a><span class="lineno">  258</span>                fs.WriteUInt(CRC32.ComputeCRC(compressedImage.GetBuffer(), (<span class="keywordtype">int</span>)compressedImage.Length, <span class="keyword">new</span> <span class="keywordtype">byte</span>[] { 73, 68, 65, 84 }));</div>
<div class="line"><a id="l00259" name="l00259"></a><span class="lineno">  259</span>            }</div>
<div class="line"><a id="l00260" name="l00260"></a><span class="lineno">  260</span> </div>
<div class="line"><a id="l00261" name="l00261"></a><span class="lineno">  261</span>            Marshal.FreeHGlobal(filteredImage);</div>
<div class="line"><a id="l00262" name="l00262"></a><span class="lineno">  262</span> </div>
<div class="line"><a id="l00263" name="l00263"></a><span class="lineno">  263</span>            <span class="comment">//IEND chunk</span></div>
<div class="line"><a id="l00264" name="l00264"></a><span class="lineno">  264</span>            fs.WriteInt(0);</div>
<div class="line"><a id="l00265" name="l00265"></a><span class="lineno">  265</span>            fs.WriteASCIIString(<span class="stringliteral">&quot;IEND&quot;</span>);</div>
<div class="line"><a id="l00266" name="l00266"></a><span class="lineno">  266</span>            fs.Write(<span class="keyword">new</span> <span class="keywordtype">byte</span>[] { 0xAE, 0x42, 0x60, 0x82 }, 0, 4);</div>
<div class="line"><a id="l00267" name="l00267"></a><span class="lineno">  267</span> </div>
<div class="line"><a id="l00268" name="l00268"></a><span class="lineno">  268</span>        }</div>
<div class="line"><a id="l00269" name="l00269"></a><span class="lineno">  269</span> </div>
<div class="line"><a id="l00270" name="l00270"></a><span class="lineno">  270</span>        <span class="keyword">public</span> unsafe <span class="keyword">static</span> <span class="keywordtype">void</span> StartAPNG(<span class="keywordtype">int</span> width, <span class="keywordtype">int</span> height, <span class="keywordtype">bool</span> hasAlpha, Stream fs, <span class="keywordtype">int</span> frameCount, <span class="keywordtype">int</span> repeatCount)</div>
<div class="line"><a id="l00271" name="l00271"></a><span class="lineno">  271</span>        {</div>
<div class="line"><a id="l00272" name="l00272"></a><span class="lineno">  272</span>            <span class="comment">//Header</span></div>
<div class="line"><a id="l00273" name="l00273"></a><span class="lineno">  273</span>            fs.Write(<span class="keyword">new</span> <span class="keywordtype">byte</span>[] { 0x89, 0x50, 0x4E, 0x47, 0x0D, 0x0A, 0x1A, 0x0A }, 0, 8);</div>
<div class="line"><a id="l00274" name="l00274"></a><span class="lineno">  274</span> </div>
<div class="line"><a id="l00275" name="l00275"></a><span class="lineno">  275</span>            <span class="comment">//IHDR chunk</span></div>
<div class="line"><a id="l00276" name="l00276"></a><span class="lineno">  276</span>            fs.WriteInt(13);</div>
<div class="line"><a id="l00277" name="l00277"></a><span class="lineno">  277</span>            <span class="keyword">using</span> (MemoryStream ihdr = <span class="keyword">new</span> MemoryStream(17))</div>
<div class="line"><a id="l00278" name="l00278"></a><span class="lineno">  278</span>            {</div>
<div class="line"><a id="l00279" name="l00279"></a><span class="lineno">  279</span>                ihdr.WriteASCIIString(<span class="stringliteral">&quot;IHDR&quot;</span>);</div>
<div class="line"><a id="l00280" name="l00280"></a><span class="lineno">  280</span>                ihdr.WriteInt(width);</div>
<div class="line"><a id="l00281" name="l00281"></a><span class="lineno">  281</span>                ihdr.WriteInt(height);</div>
<div class="line"><a id="l00282" name="l00282"></a><span class="lineno">  282</span>                ihdr.WriteByte(8); <span class="comment">//Bit depth</span></div>
<div class="line"><a id="l00283" name="l00283"></a><span class="lineno">  283</span> </div>
<div class="line"><a id="l00284" name="l00284"></a><span class="lineno">  284</span>                <span class="keywordflow">if</span> (hasAlpha)</div>
<div class="line"><a id="l00285" name="l00285"></a><span class="lineno">  285</span>                {</div>
<div class="line"><a id="l00286" name="l00286"></a><span class="lineno">  286</span>                    ihdr.WriteByte(6); <span class="comment">//Colour type</span></div>
<div class="line"><a id="l00287" name="l00287"></a><span class="lineno">  287</span>                }</div>
<div class="line"><a id="l00288" name="l00288"></a><span class="lineno">  288</span>                <span class="keywordflow">else</span></div>
<div class="line"><a id="l00289" name="l00289"></a><span class="lineno">  289</span>                {</div>
<div class="line"><a id="l00290" name="l00290"></a><span class="lineno">  290</span>                    ihdr.WriteByte(2); <span class="comment">//Colour type</span></div>
<div class="line"><a id="l00291" name="l00291"></a><span class="lineno">  291</span>                }</div>
<div class="line"><a id="l00292" name="l00292"></a><span class="lineno">  292</span> </div>
<div class="line"><a id="l00293" name="l00293"></a><span class="lineno">  293</span>                ihdr.WriteByte(0); <span class="comment">//Compression method</span></div>
<div class="line"><a id="l00294" name="l00294"></a><span class="lineno">  294</span>                ihdr.WriteByte(0); <span class="comment">//Filter method</span></div>
<div class="line"><a id="l00295" name="l00295"></a><span class="lineno">  295</span>                ihdr.WriteByte(0); <span class="comment">//Interlace</span></div>
<div class="line"><a id="l00296" name="l00296"></a><span class="lineno">  296</span> </div>
<div class="line"><a id="l00297" name="l00297"></a><span class="lineno">  297</span>                ihdr.Seek(0, SeekOrigin.Begin);</div>
<div class="line"><a id="l00298" name="l00298"></a><span class="lineno">  298</span>                ihdr.CopyTo(fs);</div>
<div class="line"><a id="l00299" name="l00299"></a><span class="lineno">  299</span> </div>
<div class="line"><a id="l00300" name="l00300"></a><span class="lineno">  300</span>                fs.WriteUInt(CRC32.ComputeCRC(ihdr));</div>
<div class="line"><a id="l00301" name="l00301"></a><span class="lineno">  301</span>            }</div>
<div class="line"><a id="l00302" name="l00302"></a><span class="lineno">  302</span> </div>
<div class="line"><a id="l00303" name="l00303"></a><span class="lineno">  303</span>            <span class="comment">//acTL chunk</span></div>
<div class="line"><a id="l00304" name="l00304"></a><span class="lineno">  304</span>            fs.WriteInt(8);</div>
<div class="line"><a id="l00305" name="l00305"></a><span class="lineno">  305</span>            <span class="keyword">using</span> (MemoryStream actl = <span class="keyword">new</span> MemoryStream(12))</div>
<div class="line"><a id="l00306" name="l00306"></a><span class="lineno">  306</span>            {</div>
<div class="line"><a id="l00307" name="l00307"></a><span class="lineno">  307</span>                actl.WriteASCIIString(<span class="stringliteral">&quot;acTL&quot;</span>);</div>
<div class="line"><a id="l00308" name="l00308"></a><span class="lineno">  308</span>                actl.WriteInt(frameCount);</div>
<div class="line"><a id="l00309" name="l00309"></a><span class="lineno">  309</span>                actl.WriteInt(repeatCount);</div>
<div class="line"><a id="l00310" name="l00310"></a><span class="lineno">  310</span> </div>
<div class="line"><a id="l00311" name="l00311"></a><span class="lineno">  311</span>                actl.Seek(0, SeekOrigin.Begin);</div>
<div class="line"><a id="l00312" name="l00312"></a><span class="lineno">  312</span>                actl.CopyTo(fs);</div>
<div class="line"><a id="l00313" name="l00313"></a><span class="lineno">  313</span> </div>
<div class="line"><a id="l00314" name="l00314"></a><span class="lineno">  314</span>                fs.WriteUInt(CRC32.ComputeCRC(actl));</div>
<div class="line"><a id="l00315" name="l00315"></a><span class="lineno">  315</span>            }</div>
<div class="line"><a id="l00316" name="l00316"></a><span class="lineno">  316</span>        }</div>
<div class="line"><a id="l00317" name="l00317"></a><span class="lineno">  317</span> </div>
<div class="line"><a id="l00318" name="l00318"></a><span class="lineno">  318</span>        <span class="keyword">internal</span> unsafe <span class="keyword">static</span> <span class="keywordtype">void</span> AddAPNGFrame(<span class="keywordtype">byte</span>* image, <span class="keywordtype">int</span> width, <span class="keywordtype">int</span> height, <span class="keywordtype">bool</span> hasAlpha, Stream fs, FilterModes filter, <span class="keywordtype">int</span> frameNumber, ushort frameDelayNumerator, ushort frameDelayDenominator, <span class="keywordtype">int</span> threadCount = 0)</div>
<div class="line"><a id="l00319" name="l00319"></a><span class="lineno">  319</span>        {</div>
<div class="line"><a id="l00320" name="l00320"></a><span class="lineno">  320</span>            <span class="keywordflow">if</span> (threadCount == 0)</div>
<div class="line"><a id="l00321" name="l00321"></a><span class="lineno">  321</span>            {</div>
<div class="line"><a id="l00322" name="l00322"></a><span class="lineno">  322</span>                threadCount = filter == FilterModes.Adaptive ? Math.Max(1, Math.Min(width / 600, Environment.ProcessorCount - 2)) : 1;</div>
<div class="line"><a id="l00323" name="l00323"></a><span class="lineno">  323</span>            }</div>
<div class="line"><a id="l00324" name="l00324"></a><span class="lineno">  324</span> </div>
<div class="line"><a id="l00325" name="l00325"></a><span class="lineno">  325</span>            <span class="keywordtype">int</span> fcTLIndex = frameNumber == 0 ? 0 : ((frameNumber - 1) * 2 + 1);</div>
<div class="line"><a id="l00326" name="l00326"></a><span class="lineno">  326</span>            <span class="keywordtype">int</span> fDATIndex = frameNumber == 0 ? 0 : (frameNumber * 2);</div>
<div class="line"><a id="l00327" name="l00327"></a><span class="lineno">  327</span> </div>
<div class="line"><a id="l00328" name="l00328"></a><span class="lineno">  328</span>            <span class="comment">//fcTL chunk</span></div>
<div class="line"><a id="l00329" name="l00329"></a><span class="lineno">  329</span>            fs.WriteInt(26);</div>
<div class="line"><a id="l00330" name="l00330"></a><span class="lineno">  330</span>            <span class="keyword">using</span> (MemoryStream fctl = <span class="keyword">new</span> MemoryStream(30))</div>
<div class="line"><a id="l00331" name="l00331"></a><span class="lineno">  331</span>            {</div>
<div class="line"><a id="l00332" name="l00332"></a><span class="lineno">  332</span>                fctl.WriteASCIIString(<span class="stringliteral">&quot;fcTL&quot;</span>);</div>
<div class="line"><a id="l00333" name="l00333"></a><span class="lineno">  333</span>                fctl.WriteInt(fcTLIndex);</div>
<div class="line"><a id="l00334" name="l00334"></a><span class="lineno">  334</span>                fctl.WriteInt(width);</div>
<div class="line"><a id="l00335" name="l00335"></a><span class="lineno">  335</span>                fctl.WriteInt(height);</div>
<div class="line"><a id="l00336" name="l00336"></a><span class="lineno">  336</span>                fctl.WriteInt(0);</div>
<div class="line"><a id="l00337" name="l00337"></a><span class="lineno">  337</span>                fctl.WriteInt(0);</div>
<div class="line"><a id="l00338" name="l00338"></a><span class="lineno">  338</span>                fctl.WriteUShort(frameDelayNumerator);</div>
<div class="line"><a id="l00339" name="l00339"></a><span class="lineno">  339</span>                fctl.WriteUShort(frameDelayDenominator);</div>
<div class="line"><a id="l00340" name="l00340"></a><span class="lineno">  340</span>                fctl.WriteByte(1);</div>
<div class="line"><a id="l00341" name="l00341"></a><span class="lineno">  341</span>                fctl.WriteByte(0);</div>
<div class="line"><a id="l00342" name="l00342"></a><span class="lineno">  342</span> </div>
<div class="line"><a id="l00343" name="l00343"></a><span class="lineno">  343</span>                fctl.Seek(0, SeekOrigin.Begin);</div>
<div class="line"><a id="l00344" name="l00344"></a><span class="lineno">  344</span>                fctl.CopyTo(fs);</div>
<div class="line"><a id="l00345" name="l00345"></a><span class="lineno">  345</span> </div>
<div class="line"><a id="l00346" name="l00346"></a><span class="lineno">  346</span>                fs.WriteUInt(CRC32.ComputeCRC(fctl));</div>
<div class="line"><a id="l00347" name="l00347"></a><span class="lineno">  347</span>            }</div>
<div class="line"><a id="l00348" name="l00348"></a><span class="lineno">  348</span> </div>
<div class="line"><a id="l00349" name="l00349"></a><span class="lineno">  349</span>            <span class="comment">//fDAT chunk</span></div>
<div class="line"><a id="l00350" name="l00350"></a><span class="lineno">  350</span>            IntPtr filteredImage;</div>
<div class="line"><a id="l00351" name="l00351"></a><span class="lineno">  351</span> </div>
<div class="line"><a id="l00352" name="l00352"></a><span class="lineno">  352</span>            <span class="keywordflow">if</span> (threadCount &gt; 1)</div>
<div class="line"><a id="l00353" name="l00353"></a><span class="lineno">  353</span>            {</div>
<div class="line"><a id="l00354" name="l00354"></a><span class="lineno">  354</span>                filteredImage = FilterImageData(image, width, height, hasAlpha ? 4 : 3, filter, threadCount);</div>
<div class="line"><a id="l00355" name="l00355"></a><span class="lineno">  355</span>            }</div>
<div class="line"><a id="l00356" name="l00356"></a><span class="lineno">  356</span>            <span class="keywordflow">else</span></div>
<div class="line"><a id="l00357" name="l00357"></a><span class="lineno">  357</span>            {</div>
<div class="line"><a id="l00358" name="l00358"></a><span class="lineno">  358</span>                filteredImage = FilterImageData(image, width, height, hasAlpha ? 4 : 3, filter);</div>
<div class="line"><a id="l00359" name="l00359"></a><span class="lineno">  359</span>            }</div>
<div class="line"><a id="l00360" name="l00360"></a><span class="lineno">  360</span> </div>
<div class="line"><a id="l00361" name="l00361"></a><span class="lineno">  361</span>            <span class="keywordflow">if</span> (frameNumber &gt; 0)</div>
<div class="line"><a id="l00362" name="l00362"></a><span class="lineno">  362</span>            {</div>
<div class="line"><a id="l00363" name="l00363"></a><span class="lineno">  363</span>                <span class="keyword">using</span> (MemoryStream compressedImage = StreamUtils.ZLibCompress(filteredImage, height * (width * (hasAlpha ? 4 : 3) + 1)))</div>
<div class="line"><a id="l00364" name="l00364"></a><span class="lineno">  364</span>                {</div>
<div class="line"><a id="l00365" name="l00365"></a><span class="lineno">  365</span>                    fs.WriteUInt((uint)compressedImage.Length + 4);</div>
<div class="line"><a id="l00366" name="l00366"></a><span class="lineno">  366</span> </div>
<div class="line"><a id="l00367" name="l00367"></a><span class="lineno">  367</span>                    fs.WriteASCIIString(<span class="stringliteral">&quot;fdAT&quot;</span>);</div>
<div class="line"><a id="l00368" name="l00368"></a><span class="lineno">  368</span>                    fs.WriteInt(fDATIndex);</div>
<div class="line"><a id="l00369" name="l00369"></a><span class="lineno">  369</span> </div>
<div class="line"><a id="l00370" name="l00370"></a><span class="lineno">  370</span>                    compressedImage.Seek(0, SeekOrigin.Begin);</div>
<div class="line"><a id="l00371" name="l00371"></a><span class="lineno">  371</span>                    compressedImage.CopyTo(fs);</div>
<div class="line"><a id="l00372" name="l00372"></a><span class="lineno">  372</span> </div>
<div class="line"><a id="l00373" name="l00373"></a><span class="lineno">  373</span>                    fs.WriteUInt(CRC32.ComputeCRC(compressedImage.GetBuffer(), (<span class="keywordtype">int</span>)compressedImage.Length, <span class="keyword">new</span> <span class="keywordtype">byte</span>[] { 102, 100, 65, 84, (byte)(fDATIndex &gt;&gt; 24), (byte)((fDATIndex &gt;&gt; 16) &amp; 255), (byte)((fDATIndex &gt;&gt; 8) &amp; 255), (byte)(fDATIndex &amp; 255) }));</div>
<div class="line"><a id="l00374" name="l00374"></a><span class="lineno">  374</span>                    <span class="comment">//fs.WriteUInt(CRC32.ComputeCRC(chunkStream.GetBuffer(), (int)chunkStream.Length, new byte[] { 73, 68, 65, 84 }));</span></div>
<div class="line"><a id="l00375" name="l00375"></a><span class="lineno">  375</span>                    <span class="comment">//fs.WriteUInt(CRC32.ComputeCRC(chunkStream));   </span></div>
<div class="line"><a id="l00376" name="l00376"></a><span class="lineno">  376</span>                }</div>
<div class="line"><a id="l00377" name="l00377"></a><span class="lineno">  377</span>            }</div>
<div class="line"><a id="l00378" name="l00378"></a><span class="lineno">  378</span>            <span class="keywordflow">else</span></div>
<div class="line"><a id="l00379" name="l00379"></a><span class="lineno">  379</span>            {</div>
<div class="line"><a id="l00380" name="l00380"></a><span class="lineno">  380</span>                <span class="keyword">using</span> (MemoryStream compressedImage = StreamUtils.ZLibCompress(filteredImage, height * (width * (hasAlpha ? 4 : 3) + 1)))</div>
<div class="line"><a id="l00381" name="l00381"></a><span class="lineno">  381</span>                {</div>
<div class="line"><a id="l00382" name="l00382"></a><span class="lineno">  382</span>                    compressedImage.Seek(0, SeekOrigin.Begin);</div>
<div class="line"><a id="l00383" name="l00383"></a><span class="lineno">  383</span>                    fs.WriteUInt((uint)compressedImage.Length);</div>
<div class="line"><a id="l00384" name="l00384"></a><span class="lineno">  384</span>                    fs.WriteASCIIString(<span class="stringliteral">&quot;IDAT&quot;</span>);</div>
<div class="line"><a id="l00385" name="l00385"></a><span class="lineno">  385</span>                    compressedImage.Seek(0, SeekOrigin.Begin);</div>
<div class="line"><a id="l00386" name="l00386"></a><span class="lineno">  386</span>                    compressedImage.CopyTo(fs);</div>
<div class="line"><a id="l00387" name="l00387"></a><span class="lineno">  387</span> </div>
<div class="line"><a id="l00388" name="l00388"></a><span class="lineno">  388</span>                    fs.WriteUInt(CRC32.ComputeCRC(compressedImage.GetBuffer(), (int)compressedImage.Length, <span class="keyword">new</span> <span class="keywordtype">byte</span>[] { 73, 68, 65, 84 }));</div>
<div class="line"><a id="l00389" name="l00389"></a><span class="lineno">  389</span>                }</div>
<div class="line"><a id="l00390" name="l00390"></a><span class="lineno">  390</span>            }</div>
<div class="line"><a id="l00391" name="l00391"></a><span class="lineno">  391</span> </div>
<div class="line"><a id="l00392" name="l00392"></a><span class="lineno">  392</span>            Marshal.FreeHGlobal(filteredImage);</div>
<div class="line"><a id="l00393" name="l00393"></a><span class="lineno">  393</span>        }</div>
<div class="line"><a id="l00394" name="l00394"></a><span class="lineno">  394</span> </div>
<div class="line"><a id="l00395" name="l00395"></a><span class="lineno">  395</span>        <span class="keyword">internal</span> <span class="keyword">static</span> unsafe MemoryStream CompressAPNGFrame(<span class="keywordtype">byte</span>* image, <span class="keywordtype">int</span> width, <span class="keywordtype">int</span> height, <span class="keywordtype">bool</span> hasAlpha, FilterModes filter, <span class="keywordtype">int</span> threadCount)</div>
<div class="line"><a id="l00396" name="l00396"></a><span class="lineno">  396</span>        {</div>
<div class="line"><a id="l00397" name="l00397"></a><span class="lineno">  397</span>            <span class="comment">//fDAT chunk</span></div>
<div class="line"><a id="l00398" name="l00398"></a><span class="lineno">  398</span>            IntPtr filteredImage;</div>
<div class="line"><a id="l00399" name="l00399"></a><span class="lineno">  399</span> </div>
<div class="line"><a id="l00400" name="l00400"></a><span class="lineno">  400</span>            <span class="keywordflow">if</span> (threadCount &gt; 1)</div>
<div class="line"><a id="l00401" name="l00401"></a><span class="lineno">  401</span>            {</div>
<div class="line"><a id="l00402" name="l00402"></a><span class="lineno">  402</span>                filteredImage = FilterImageData(image, width, height, hasAlpha ? 4 : 3, filter, threadCount);</div>
<div class="line"><a id="l00403" name="l00403"></a><span class="lineno">  403</span>            }</div>
<div class="line"><a id="l00404" name="l00404"></a><span class="lineno">  404</span>            <span class="keywordflow">else</span></div>
<div class="line"><a id="l00405" name="l00405"></a><span class="lineno">  405</span>            {</div>
<div class="line"><a id="l00406" name="l00406"></a><span class="lineno">  406</span>                filteredImage = FilterImageData(image, width, height, hasAlpha ? 4 : 3, filter);</div>
<div class="line"><a id="l00407" name="l00407"></a><span class="lineno">  407</span>            }</div>
<div class="line"><a id="l00408" name="l00408"></a><span class="lineno">  408</span> </div>
<div class="line"><a id="l00409" name="l00409"></a><span class="lineno">  409</span>            MemoryStream compressedImage = StreamUtils.ZLibCompress(filteredImage, height * (width * (hasAlpha ? 4 : 3) + 1));</div>
<div class="line"><a id="l00410" name="l00410"></a><span class="lineno">  410</span> </div>
<div class="line"><a id="l00411" name="l00411"></a><span class="lineno">  411</span>            Marshal.FreeHGlobal(filteredImage);</div>
<div class="line"><a id="l00412" name="l00412"></a><span class="lineno">  412</span> </div>
<div class="line"><a id="l00413" name="l00413"></a><span class="lineno">  413</span>            <span class="keywordflow">return</span> compressedImage;</div>
<div class="line"><a id="l00414" name="l00414"></a><span class="lineno">  414</span>        }</div>
<div class="line"><a id="l00415" name="l00415"></a><span class="lineno">  415</span> </div>
<div class="line"><a id="l00416" name="l00416"></a><span class="lineno">  416</span>        <span class="keyword">internal</span> <span class="keyword">static</span> <span class="keywordtype">void</span> AddPreCompressedAPNGFrame(AnimatedPNG.CompressedFrame compressedFrame, <span class="keywordtype">int</span> width, <span class="keywordtype">int</span> height, <span class="keywordtype">bool</span> hasAlpha, Stream fs, <span class="keywordtype">int</span> frameNumber, ushort frameDelayNumerator, ushort frameDelayDenominator)</div>
<div class="line"><a id="l00417" name="l00417"></a><span class="lineno">  417</span>        {</div>
<div class="line"><a id="l00418" name="l00418"></a><span class="lineno">  418</span>            <span class="keywordtype">int</span> fcTLIndex = frameNumber == 0 ? 0 : ((frameNumber - 1) * 2 + 1);</div>
<div class="line"><a id="l00419" name="l00419"></a><span class="lineno">  419</span>            <span class="keywordtype">int</span> fDATIndex = frameNumber == 0 ? 0 : (frameNumber * 2);</div>
<div class="line"><a id="l00420" name="l00420"></a><span class="lineno">  420</span> </div>
<div class="line"><a id="l00421" name="l00421"></a><span class="lineno">  421</span>            <span class="comment">//fcTL chunk</span></div>
<div class="line"><a id="l00422" name="l00422"></a><span class="lineno">  422</span>            fs.WriteInt(26);</div>
<div class="line"><a id="l00423" name="l00423"></a><span class="lineno">  423</span>            <span class="keyword">using</span> (MemoryStream fctl = <span class="keyword">new</span> MemoryStream(30))</div>
<div class="line"><a id="l00424" name="l00424"></a><span class="lineno">  424</span>            {</div>
<div class="line"><a id="l00425" name="l00425"></a><span class="lineno">  425</span>                fctl.WriteASCIIString(<span class="stringliteral">&quot;fcTL&quot;</span>);</div>
<div class="line"><a id="l00426" name="l00426"></a><span class="lineno">  426</span>                fctl.WriteInt(fcTLIndex);</div>
<div class="line"><a id="l00427" name="l00427"></a><span class="lineno">  427</span>                fctl.WriteInt(width);</div>
<div class="line"><a id="l00428" name="l00428"></a><span class="lineno">  428</span>                fctl.WriteInt(height);</div>
<div class="line"><a id="l00429" name="l00429"></a><span class="lineno">  429</span>                fctl.WriteInt(0);</div>
<div class="line"><a id="l00430" name="l00430"></a><span class="lineno">  430</span>                fctl.WriteInt(0);</div>
<div class="line"><a id="l00431" name="l00431"></a><span class="lineno">  431</span>                fctl.WriteUShort(frameDelayNumerator);</div>
<div class="line"><a id="l00432" name="l00432"></a><span class="lineno">  432</span>                fctl.WriteUShort(frameDelayDenominator);</div>
<div class="line"><a id="l00433" name="l00433"></a><span class="lineno">  433</span> </div>
<div class="line"><a id="l00434" name="l00434"></a><span class="lineno">  434</span>                <span class="keywordflow">if</span> (compressedFrame.InterframeCompression == AnimatedPNG.InterframeCompression.None || frameNumber == 0)</div>
<div class="line"><a id="l00435" name="l00435"></a><span class="lineno">  435</span>                {</div>
<div class="line"><a id="l00436" name="l00436"></a><span class="lineno">  436</span>                    fctl.WriteByte(0);</div>
<div class="line"><a id="l00437" name="l00437"></a><span class="lineno">  437</span>                    fctl.WriteByte(0);</div>
<div class="line"><a id="l00438" name="l00438"></a><span class="lineno">  438</span>                }</div>
<div class="line"><a id="l00439" name="l00439"></a><span class="lineno">  439</span>                <span class="keywordflow">else</span> <span class="keywordflow">if</span> (compressedFrame.InterframeCompression == AnimatedPNG.InterframeCompression.First)</div>
<div class="line"><a id="l00440" name="l00440"></a><span class="lineno">  440</span>                {</div>
<div class="line"><a id="l00441" name="l00441"></a><span class="lineno">  441</span>                    fctl.WriteByte(2);</div>
<div class="line"><a id="l00442" name="l00442"></a><span class="lineno">  442</span>                    fctl.WriteByte(1);</div>
<div class="line"><a id="l00443" name="l00443"></a><span class="lineno">  443</span>                }</div>
<div class="line"><a id="l00444" name="l00444"></a><span class="lineno">  444</span>                <span class="keywordflow">else</span> <span class="keywordflow">if</span> (compressedFrame.InterframeCompression == AnimatedPNG.InterframeCompression.Previous)</div>
<div class="line"><a id="l00445" name="l00445"></a><span class="lineno">  445</span>                {</div>
<div class="line"><a id="l00446" name="l00446"></a><span class="lineno">  446</span>                    fctl.WriteByte(0);</div>
<div class="line"><a id="l00447" name="l00447"></a><span class="lineno">  447</span>                    fctl.WriteByte(1);</div>
<div class="line"><a id="l00448" name="l00448"></a><span class="lineno">  448</span>                }</div>
<div class="line"><a id="l00449" name="l00449"></a><span class="lineno">  449</span> </div>
<div class="line"><a id="l00450" name="l00450"></a><span class="lineno">  450</span>                fctl.Seek(0, SeekOrigin.Begin);</div>
<div class="line"><a id="l00451" name="l00451"></a><span class="lineno">  451</span>                fctl.CopyTo(fs);</div>
<div class="line"><a id="l00452" name="l00452"></a><span class="lineno">  452</span> </div>
<div class="line"><a id="l00453" name="l00453"></a><span class="lineno">  453</span>                fs.WriteUInt(CRC32.ComputeCRC(fctl));</div>
<div class="line"><a id="l00454" name="l00454"></a><span class="lineno">  454</span>            }</div>
<div class="line"><a id="l00455" name="l00455"></a><span class="lineno">  455</span> </div>
<div class="line"><a id="l00456" name="l00456"></a><span class="lineno">  456</span>            MemoryStream compressedImage = compressedFrame.compressedStream;</div>
<div class="line"><a id="l00457" name="l00457"></a><span class="lineno">  457</span> </div>
<div class="line"><a id="l00458" name="l00458"></a><span class="lineno">  458</span>            <span class="keywordflow">if</span> (frameNumber &gt; 0)</div>
<div class="line"><a id="l00459" name="l00459"></a><span class="lineno">  459</span>            {</div>
<div class="line"><a id="l00460" name="l00460"></a><span class="lineno">  460</span>                fs.WriteUInt((uint)compressedImage.Length + 4);</div>
<div class="line"><a id="l00461" name="l00461"></a><span class="lineno">  461</span> </div>
<div class="line"><a id="l00462" name="l00462"></a><span class="lineno">  462</span>                fs.WriteASCIIString(<span class="stringliteral">&quot;fdAT&quot;</span>);</div>
<div class="line"><a id="l00463" name="l00463"></a><span class="lineno">  463</span>                fs.WriteInt(fDATIndex);</div>
<div class="line"><a id="l00464" name="l00464"></a><span class="lineno">  464</span> </div>
<div class="line"><a id="l00465" name="l00465"></a><span class="lineno">  465</span>                compressedImage.Seek(0, SeekOrigin.Begin);</div>
<div class="line"><a id="l00466" name="l00466"></a><span class="lineno">  466</span>                compressedImage.CopyTo(fs);</div>
<div class="line"><a id="l00467" name="l00467"></a><span class="lineno">  467</span> </div>
<div class="line"><a id="l00468" name="l00468"></a><span class="lineno">  468</span>                fs.WriteUInt(CRC32.ComputeCRC(compressedImage.GetBuffer(), (<span class="keywordtype">int</span>)compressedImage.Length, <span class="keyword">new</span> <span class="keywordtype">byte</span>[] { 102, 100, 65, 84, (byte)(fDATIndex &gt;&gt; 24), (byte)((fDATIndex &gt;&gt; 16) &amp; 255), (byte)((fDATIndex &gt;&gt; 8) &amp; 255), (byte)(fDATIndex &amp; 255) }));</div>
<div class="line"><a id="l00469" name="l00469"></a><span class="lineno">  469</span>            }</div>
<div class="line"><a id="l00470" name="l00470"></a><span class="lineno">  470</span>            <span class="keywordflow">else</span></div>
<div class="line"><a id="l00471" name="l00471"></a><span class="lineno">  471</span>            {</div>
<div class="line"><a id="l00472" name="l00472"></a><span class="lineno">  472</span>                compressedImage.Seek(0, SeekOrigin.Begin);</div>
<div class="line"><a id="l00473" name="l00473"></a><span class="lineno">  473</span>                fs.WriteUInt((uint)compressedImage.Length);</div>
<div class="line"><a id="l00474" name="l00474"></a><span class="lineno">  474</span>                fs.WriteASCIIString(<span class="stringliteral">&quot;IDAT&quot;</span>);</div>
<div class="line"><a id="l00475" name="l00475"></a><span class="lineno">  475</span>                compressedImage.Seek(0, SeekOrigin.Begin);</div>
<div class="line"><a id="l00476" name="l00476"></a><span class="lineno">  476</span>                compressedImage.CopyTo(fs);</div>
<div class="line"><a id="l00477" name="l00477"></a><span class="lineno">  477</span> </div>
<div class="line"><a id="l00478" name="l00478"></a><span class="lineno">  478</span>                fs.WriteUInt(CRC32.ComputeCRC(compressedImage.GetBuffer(), (<span class="keywordtype">int</span>)compressedImage.Length, <span class="keyword">new</span> <span class="keywordtype">byte</span>[] { 73, 68, 65, 84 }));</div>
<div class="line"><a id="l00479" name="l00479"></a><span class="lineno">  479</span>            }</div>
<div class="line"><a id="l00480" name="l00480"></a><span class="lineno">  480</span>        }</div>
<div class="line"><a id="l00481" name="l00481"></a><span class="lineno">  481</span> </div>
<div class="line"><a id="l00482" name="l00482"></a><span class="lineno">  482</span>        <span class="keyword">internal</span> unsafe <span class="keyword">static</span> <span class="keywordtype">void</span> FinishAPNG(Stream fs)</div>
<div class="line"><a id="l00483" name="l00483"></a><span class="lineno">  483</span>        {</div>
<div class="line"><a id="l00484" name="l00484"></a><span class="lineno">  484</span>            <span class="comment">//IEND chunk</span></div>
<div class="line"><a id="l00485" name="l00485"></a><span class="lineno">  485</span>            fs.WriteInt(0);</div>
<div class="line"><a id="l00486" name="l00486"></a><span class="lineno">  486</span>            fs.WriteASCIIString(<span class="stringliteral">&quot;IEND&quot;</span>);</div>
<div class="line"><a id="l00487" name="l00487"></a><span class="lineno">  487</span>            fs.Write(<span class="keyword">new</span> <span class="keywordtype">byte</span>[] { 0xAE, 0x42, 0x60, 0x82 }, 0, 4);</div>
<div class="line"><a id="l00488" name="l00488"></a><span class="lineno">  488</span>        }</div>
<div class="line"><a id="l00489" name="l00489"></a><span class="lineno">  489</span> </div>
<div class="line"><a id="l00490" name="l00490"></a><span class="lineno">  490</span>        <span class="keyword">internal</span> <span class="keyword">enum</span> FilterModes</div>
<div class="line"><a id="l00491" name="l00491"></a><span class="lineno">  491</span>        {</div>
<div class="line"><a id="l00492" name="l00492"></a><span class="lineno">  492</span>            None = 0,</div>
<div class="line"><a id="l00493" name="l00493"></a><span class="lineno">  493</span>            Sub = 1,</div>
<div class="line"><a id="l00494" name="l00494"></a><span class="lineno">  494</span>            Up = 2,</div>
<div class="line"><a id="l00495" name="l00495"></a><span class="lineno">  495</span>            Average = 3,</div>
<div class="line"><a id="l00496" name="l00496"></a><span class="lineno">  496</span>            Paeth = 4,</div>
<div class="line"><a id="l00497" name="l00497"></a><span class="lineno">  497</span>            Adaptive = -1</div>
<div class="line"><a id="l00498" name="l00498"></a><span class="lineno">  498</span>        }</div>
<div class="line"><a id="l00499" name="l00499"></a><span class="lineno">  499</span> </div>
<div class="line"><a id="l00500" name="l00500"></a><span class="lineno">  500</span>        <span class="keyword">internal</span> unsafe <span class="keyword">static</span> <span class="keywordtype">void</span> FilterRow(<span class="keywordtype">byte</span>* image, <span class="keywordtype">int</span> width, <span class="keywordtype">int</span> pixelSize, <span class="keywordtype">int</span> stride, <span class="keywordtype">int</span> y, FilterModes filter, <span class="keywordtype">byte</span>* destinationImage, <span class="keywordtype">byte</span>* tempBuffer)</div>
<div class="line"><a id="l00501" name="l00501"></a><span class="lineno">  501</span>        {</div>
<div class="line"><a id="l00502" name="l00502"></a><span class="lineno">  502</span>            <span class="keywordtype">int</span> startIndex = y * stride;</div>
<div class="line"><a id="l00503" name="l00503"></a><span class="lineno">  503</span>            <span class="keywordtype">int</span> destinationIndex = y * (stride + 1);</div>
<div class="line"><a id="l00504" name="l00504"></a><span class="lineno">  504</span> </div>
<div class="line"><a id="l00505" name="l00505"></a><span class="lineno">  505</span>            <span class="keywordflow">if</span> (filter == FilterModes.None)</div>
<div class="line"><a id="l00506" name="l00506"></a><span class="lineno">  506</span>            {</div>
<div class="line"><a id="l00507" name="l00507"></a><span class="lineno">  507</span>                destinationImage[destinationIndex++] = 0;</div>
<div class="line"><a id="l00508" name="l00508"></a><span class="lineno">  508</span>                <span class="keywordflow">for</span> (<span class="keywordtype">int</span> x = 0; x &lt; width; x++)</div>
<div class="line"><a id="l00509" name="l00509"></a><span class="lineno">  509</span>                {</div>
<div class="line"><a id="l00510" name="l00510"></a><span class="lineno">  510</span>                    destinationImage[destinationIndex++] = image[startIndex++];</div>
<div class="line"><a id="l00511" name="l00511"></a><span class="lineno">  511</span>                    destinationImage[destinationIndex++] = image[startIndex++];</div>
<div class="line"><a id="l00512" name="l00512"></a><span class="lineno">  512</span>                    destinationImage[destinationIndex++] = image[startIndex++];</div>
<div class="line"><a id="l00513" name="l00513"></a><span class="lineno">  513</span> </div>
<div class="line"><a id="l00514" name="l00514"></a><span class="lineno">  514</span>                    <span class="keywordflow">if</span> (pixelSize == 4)</div>
<div class="line"><a id="l00515" name="l00515"></a><span class="lineno">  515</span>                    {</div>
<div class="line"><a id="l00516" name="l00516"></a><span class="lineno">  516</span>                        destinationImage[destinationIndex++] = image[startIndex++];</div>
<div class="line"><a id="l00517" name="l00517"></a><span class="lineno">  517</span>                    }</div>
<div class="line"><a id="l00518" name="l00518"></a><span class="lineno">  518</span> </div>
<div class="line"><a id="l00519" name="l00519"></a><span class="lineno">  519</span>                }</div>
<div class="line"><a id="l00520" name="l00520"></a><span class="lineno">  520</span>            }</div>
<div class="line"><a id="l00521" name="l00521"></a><span class="lineno">  521</span>            <span class="keywordflow">else</span> <span class="keywordflow">if</span> (filter == FilterModes.Sub)</div>
<div class="line"><a id="l00522" name="l00522"></a><span class="lineno">  522</span>            {</div>
<div class="line"><a id="l00523" name="l00523"></a><span class="lineno">  523</span>                destinationImage[destinationIndex++] = 1;</div>
<div class="line"><a id="l00524" name="l00524"></a><span class="lineno">  524</span>                <span class="keywordflow">for</span> (<span class="keywordtype">int</span> x = 0; x &lt; width; x++)</div>
<div class="line"><a id="l00525" name="l00525"></a><span class="lineno">  525</span>                {</div>
<div class="line"><a id="l00526" name="l00526"></a><span class="lineno">  526</span>                    <span class="keywordflow">if</span> (x &gt; 0)</div>
<div class="line"><a id="l00527" name="l00527"></a><span class="lineno">  527</span>                    {</div>
<div class="line"><a id="l00528" name="l00528"></a><span class="lineno">  528</span>                        destinationImage[destinationIndex++] = (byte)(image[startIndex] - image[startIndex++ - pixelSize]);</div>
<div class="line"><a id="l00529" name="l00529"></a><span class="lineno">  529</span>                        destinationImage[destinationIndex++] = (byte)(image[startIndex] - image[startIndex++ - pixelSize]);</div>
<div class="line"><a id="l00530" name="l00530"></a><span class="lineno">  530</span>                        destinationImage[destinationIndex++] = (byte)(image[startIndex] - image[startIndex++ - pixelSize]);</div>
<div class="line"><a id="l00531" name="l00531"></a><span class="lineno">  531</span>                        <span class="keywordflow">if</span> (pixelSize == 4)</div>
<div class="line"><a id="l00532" name="l00532"></a><span class="lineno">  532</span>                        {</div>
<div class="line"><a id="l00533" name="l00533"></a><span class="lineno">  533</span>                            destinationImage[destinationIndex++] = (byte)(image[startIndex] - image[startIndex++ - pixelSize]);</div>
<div class="line"><a id="l00534" name="l00534"></a><span class="lineno">  534</span>                        }</div>
<div class="line"><a id="l00535" name="l00535"></a><span class="lineno">  535</span>                    }</div>
<div class="line"><a id="l00536" name="l00536"></a><span class="lineno">  536</span>                    <span class="keywordflow">else</span></div>
<div class="line"><a id="l00537" name="l00537"></a><span class="lineno">  537</span>                    {</div>
<div class="line"><a id="l00538" name="l00538"></a><span class="lineno">  538</span>                        destinationImage[destinationIndex++] = image[startIndex++];</div>
<div class="line"><a id="l00539" name="l00539"></a><span class="lineno">  539</span>                        destinationImage[destinationIndex++] = image[startIndex++];</div>
<div class="line"><a id="l00540" name="l00540"></a><span class="lineno">  540</span>                        destinationImage[destinationIndex++] = image[startIndex++];</div>
<div class="line"><a id="l00541" name="l00541"></a><span class="lineno">  541</span>                        <span class="keywordflow">if</span> (pixelSize == 4)</div>
<div class="line"><a id="l00542" name="l00542"></a><span class="lineno">  542</span>                        {</div>
<div class="line"><a id="l00543" name="l00543"></a><span class="lineno">  543</span>                            destinationImage[destinationIndex++] = image[startIndex++];</div>
<div class="line"><a id="l00544" name="l00544"></a><span class="lineno">  544</span>                        }</div>
<div class="line"><a id="l00545" name="l00545"></a><span class="lineno">  545</span>                    }</div>
<div class="line"><a id="l00546" name="l00546"></a><span class="lineno">  546</span>                }</div>
<div class="line"><a id="l00547" name="l00547"></a><span class="lineno">  547</span>            }</div>
<div class="line"><a id="l00548" name="l00548"></a><span class="lineno">  548</span>            <span class="keywordflow">else</span> <span class="keywordflow">if</span> (filter == FilterModes.Up)</div>
<div class="line"><a id="l00549" name="l00549"></a><span class="lineno">  549</span>            {</div>
<div class="line"><a id="l00550" name="l00550"></a><span class="lineno">  550</span>                destinationImage[destinationIndex++] = 2;</div>
<div class="line"><a id="l00551" name="l00551"></a><span class="lineno">  551</span>                <span class="keywordflow">for</span> (<span class="keywordtype">int</span> x = 0; x &lt; width; x++)</div>
<div class="line"><a id="l00552" name="l00552"></a><span class="lineno">  552</span>                {</div>
<div class="line"><a id="l00553" name="l00553"></a><span class="lineno">  553</span>                    <span class="keywordflow">if</span> (y &gt; 0)</div>
<div class="line"><a id="l00554" name="l00554"></a><span class="lineno">  554</span>                    {</div>
<div class="line"><a id="l00555" name="l00555"></a><span class="lineno">  555</span>                        destinationImage[destinationIndex++] = (byte)(image[startIndex] - image[startIndex++ - stride]);</div>
<div class="line"><a id="l00556" name="l00556"></a><span class="lineno">  556</span>                        destinationImage[destinationIndex++] = (byte)(image[startIndex] - image[startIndex++ - stride]);</div>
<div class="line"><a id="l00557" name="l00557"></a><span class="lineno">  557</span>                        destinationImage[destinationIndex++] = (byte)(image[startIndex] - image[startIndex++ - stride]);</div>
<div class="line"><a id="l00558" name="l00558"></a><span class="lineno">  558</span>                        <span class="keywordflow">if</span> (pixelSize == 4)</div>
<div class="line"><a id="l00559" name="l00559"></a><span class="lineno">  559</span>                        {</div>
<div class="line"><a id="l00560" name="l00560"></a><span class="lineno">  560</span>                            destinationImage[destinationIndex++] = (byte)(image[startIndex] - image[startIndex++ - stride]);</div>
<div class="line"><a id="l00561" name="l00561"></a><span class="lineno">  561</span>                        }</div>
<div class="line"><a id="l00562" name="l00562"></a><span class="lineno">  562</span>                    }</div>
<div class="line"><a id="l00563" name="l00563"></a><span class="lineno">  563</span>                    <span class="keywordflow">else</span></div>
<div class="line"><a id="l00564" name="l00564"></a><span class="lineno">  564</span>                    {</div>
<div class="line"><a id="l00565" name="l00565"></a><span class="lineno">  565</span>                        destinationImage[destinationIndex++] = image[startIndex++];</div>
<div class="line"><a id="l00566" name="l00566"></a><span class="lineno">  566</span>                        destinationImage[destinationIndex++] = image[startIndex++];</div>
<div class="line"><a id="l00567" name="l00567"></a><span class="lineno">  567</span>                        destinationImage[destinationIndex++] = image[startIndex++];</div>
<div class="line"><a id="l00568" name="l00568"></a><span class="lineno">  568</span>                        <span class="keywordflow">if</span> (pixelSize == 4)</div>
<div class="line"><a id="l00569" name="l00569"></a><span class="lineno">  569</span>                        {</div>
<div class="line"><a id="l00570" name="l00570"></a><span class="lineno">  570</span>                            destinationImage[destinationIndex++] = image[startIndex++];</div>
<div class="line"><a id="l00571" name="l00571"></a><span class="lineno">  571</span>                        }</div>
<div class="line"><a id="l00572" name="l00572"></a><span class="lineno">  572</span>                    }</div>
<div class="line"><a id="l00573" name="l00573"></a><span class="lineno">  573</span>                }</div>
<div class="line"><a id="l00574" name="l00574"></a><span class="lineno">  574</span>            }</div>
<div class="line"><a id="l00575" name="l00575"></a><span class="lineno">  575</span>            <span class="keywordflow">else</span> <span class="keywordflow">if</span> (filter == FilterModes.Average)</div>
<div class="line"><a id="l00576" name="l00576"></a><span class="lineno">  576</span>            {</div>
<div class="line"><a id="l00577" name="l00577"></a><span class="lineno">  577</span>                destinationImage[destinationIndex++] = 3;</div>
<div class="line"><a id="l00578" name="l00578"></a><span class="lineno">  578</span>                <span class="keywordflow">for</span> (<span class="keywordtype">int</span> x = 0; x &lt; width; x++)</div>
<div class="line"><a id="l00579" name="l00579"></a><span class="lineno">  579</span>                {</div>
<div class="line"><a id="l00580" name="l00580"></a><span class="lineno">  580</span>                    <span class="keywordflow">if</span> (x &gt; 0 &amp;&amp; y &gt; 0)</div>
<div class="line"><a id="l00581" name="l00581"></a><span class="lineno">  581</span>                    {</div>
<div class="line"><a id="l00582" name="l00582"></a><span class="lineno">  582</span>                        destinationImage[destinationIndex++] = (byte)(image[startIndex] - (image[startIndex - pixelSize] + image[startIndex++ - stride]) / 2);</div>
<div class="line"><a id="l00583" name="l00583"></a><span class="lineno">  583</span>                        destinationImage[destinationIndex++] = (byte)(image[startIndex] - (image[startIndex - pixelSize] + image[startIndex++ - stride]) / 2);</div>
<div class="line"><a id="l00584" name="l00584"></a><span class="lineno">  584</span>                        destinationImage[destinationIndex++] = (byte)(image[startIndex] - (image[startIndex - pixelSize] + image[startIndex++ - stride]) / 2);</div>
<div class="line"><a id="l00585" name="l00585"></a><span class="lineno">  585</span>                        <span class="keywordflow">if</span> (pixelSize == 4)</div>
<div class="line"><a id="l00586" name="l00586"></a><span class="lineno">  586</span>                        {</div>
<div class="line"><a id="l00587" name="l00587"></a><span class="lineno">  587</span>                            destinationImage[destinationIndex++] = (byte)(image[startIndex] - (image[startIndex - pixelSize] + image[startIndex++ - stride]) / 2);</div>
<div class="line"><a id="l00588" name="l00588"></a><span class="lineno">  588</span>                        }</div>
<div class="line"><a id="l00589" name="l00589"></a><span class="lineno">  589</span>                    }</div>
<div class="line"><a id="l00590" name="l00590"></a><span class="lineno">  590</span>                    <span class="keywordflow">else</span> <span class="keywordflow">if</span> (x &gt; 0 &amp;&amp; y == 0)</div>
<div class="line"><a id="l00591" name="l00591"></a><span class="lineno">  591</span>                    {</div>
<div class="line"><a id="l00592" name="l00592"></a><span class="lineno">  592</span>                        destinationImage[destinationIndex++] = (byte)(image[startIndex] - image[startIndex++ - pixelSize] / 2);</div>
<div class="line"><a id="l00593" name="l00593"></a><span class="lineno">  593</span>                        destinationImage[destinationIndex++] = (byte)(image[startIndex] - image[startIndex++ - pixelSize] / 2);</div>
<div class="line"><a id="l00594" name="l00594"></a><span class="lineno">  594</span>                        destinationImage[destinationIndex++] = (byte)(image[startIndex] - image[startIndex++ - pixelSize] / 2);</div>
<div class="line"><a id="l00595" name="l00595"></a><span class="lineno">  595</span>                        <span class="keywordflow">if</span> (pixelSize == 4)</div>
<div class="line"><a id="l00596" name="l00596"></a><span class="lineno">  596</span>                        {</div>
<div class="line"><a id="l00597" name="l00597"></a><span class="lineno">  597</span>                            destinationImage[destinationIndex++] = (byte)(image[startIndex] - image[startIndex++ - pixelSize] / 2);</div>
<div class="line"><a id="l00598" name="l00598"></a><span class="lineno">  598</span>                        }</div>
<div class="line"><a id="l00599" name="l00599"></a><span class="lineno">  599</span>                    }</div>
<div class="line"><a id="l00600" name="l00600"></a><span class="lineno">  600</span>                    <span class="keywordflow">else</span> <span class="keywordflow">if</span> (x == 0 &amp;&amp; y &gt; 0)</div>
<div class="line"><a id="l00601" name="l00601"></a><span class="lineno">  601</span>                    {</div>
<div class="line"><a id="l00602" name="l00602"></a><span class="lineno">  602</span>                        destinationImage[destinationIndex++] = (byte)(image[startIndex] - image[startIndex++ - stride] / 2);</div>
<div class="line"><a id="l00603" name="l00603"></a><span class="lineno">  603</span>                        destinationImage[destinationIndex++] = (byte)(image[startIndex] - image[startIndex++ - stride] / 2);</div>
<div class="line"><a id="l00604" name="l00604"></a><span class="lineno">  604</span>                        destinationImage[destinationIndex++] = (byte)(image[startIndex] - image[startIndex++ - stride] / 2);</div>
<div class="line"><a id="l00605" name="l00605"></a><span class="lineno">  605</span>                        <span class="keywordflow">if</span> (pixelSize == 4)</div>
<div class="line"><a id="l00606" name="l00606"></a><span class="lineno">  606</span>                        {</div>
<div class="line"><a id="l00607" name="l00607"></a><span class="lineno">  607</span>                            destinationImage[destinationIndex++] = (byte)(image[startIndex] - image[startIndex++ - stride] / 2);</div>
<div class="line"><a id="l00608" name="l00608"></a><span class="lineno">  608</span>                        }</div>
<div class="line"><a id="l00609" name="l00609"></a><span class="lineno">  609</span>                    }</div>
<div class="line"><a id="l00610" name="l00610"></a><span class="lineno">  610</span>                    <span class="keywordflow">else</span></div>
<div class="line"><a id="l00611" name="l00611"></a><span class="lineno">  611</span>                    {</div>
<div class="line"><a id="l00612" name="l00612"></a><span class="lineno">  612</span>                        destinationImage[destinationIndex++] = image[startIndex++];</div>
<div class="line"><a id="l00613" name="l00613"></a><span class="lineno">  613</span>                        destinationImage[destinationIndex++] = image[startIndex++];</div>
<div class="line"><a id="l00614" name="l00614"></a><span class="lineno">  614</span>                        destinationImage[destinationIndex++] = image[startIndex++];</div>
<div class="line"><a id="l00615" name="l00615"></a><span class="lineno">  615</span>                        <span class="keywordflow">if</span> (pixelSize == 4)</div>
<div class="line"><a id="l00616" name="l00616"></a><span class="lineno">  616</span>                        {</div>
<div class="line"><a id="l00617" name="l00617"></a><span class="lineno">  617</span>                            destinationImage[destinationIndex++] = image[startIndex++];</div>
<div class="line"><a id="l00618" name="l00618"></a><span class="lineno">  618</span>                        }</div>
<div class="line"><a id="l00619" name="l00619"></a><span class="lineno">  619</span>                    }</div>
<div class="line"><a id="l00620" name="l00620"></a><span class="lineno">  620</span>                }</div>
<div class="line"><a id="l00621" name="l00621"></a><span class="lineno">  621</span>            }</div>
<div class="line"><a id="l00622" name="l00622"></a><span class="lineno">  622</span>            <span class="keywordflow">else</span> <span class="keywordflow">if</span> (filter == FilterModes.Paeth)</div>
<div class="line"><a id="l00623" name="l00623"></a><span class="lineno">  623</span>            {</div>
<div class="line"><a id="l00624" name="l00624"></a><span class="lineno">  624</span>                destinationImage[destinationIndex++] = 4;</div>
<div class="line"><a id="l00625" name="l00625"></a><span class="lineno">  625</span>                <span class="keywordflow">for</span> (<span class="keywordtype">int</span> x = 0; x &lt; width; x++)</div>
<div class="line"><a id="l00626" name="l00626"></a><span class="lineno">  626</span>                {</div>
<div class="line"><a id="l00627" name="l00627"></a><span class="lineno">  627</span>                    <span class="keywordflow">if</span> (x &gt; 0 &amp;&amp; y &gt; 0)</div>
<div class="line"><a id="l00628" name="l00628"></a><span class="lineno">  628</span>                    {</div>
<div class="line"><a id="l00629" name="l00629"></a><span class="lineno">  629</span>                        destinationImage[destinationIndex++] = (byte)(image[startIndex] - PaethPredictor(image[startIndex - pixelSize], image[startIndex - stride], image[startIndex++ - pixelSize - stride]));</div>
<div class="line"><a id="l00630" name="l00630"></a><span class="lineno">  630</span>                        destinationImage[destinationIndex++] = (byte)(image[startIndex] - PaethPredictor(image[startIndex - pixelSize], image[startIndex - stride], image[startIndex++ - pixelSize - stride]));</div>
<div class="line"><a id="l00631" name="l00631"></a><span class="lineno">  631</span>                        destinationImage[destinationIndex++] = (byte)(image[startIndex] - PaethPredictor(image[startIndex - pixelSize], image[startIndex - stride], image[startIndex++ - pixelSize - stride]));</div>
<div class="line"><a id="l00632" name="l00632"></a><span class="lineno">  632</span>                        <span class="keywordflow">if</span> (pixelSize == 4)</div>
<div class="line"><a id="l00633" name="l00633"></a><span class="lineno">  633</span>                        {</div>
<div class="line"><a id="l00634" name="l00634"></a><span class="lineno">  634</span>                            destinationImage[destinationIndex++] = (byte)(image[startIndex] - PaethPredictor(image[startIndex - pixelSize], image[startIndex - stride], image[startIndex++ - pixelSize - stride]));</div>
<div class="line"><a id="l00635" name="l00635"></a><span class="lineno">  635</span>                        }</div>
<div class="line"><a id="l00636" name="l00636"></a><span class="lineno">  636</span>                    }</div>
<div class="line"><a id="l00637" name="l00637"></a><span class="lineno">  637</span>                    <span class="keywordflow">else</span> <span class="keywordflow">if</span> (x &gt; 0 &amp;&amp; y == 0)</div>
<div class="line"><a id="l00638" name="l00638"></a><span class="lineno">  638</span>                    {</div>
<div class="line"><a id="l00639" name="l00639"></a><span class="lineno">  639</span>                        destinationImage[destinationIndex++] = (byte)(image[startIndex] - image[startIndex++ - pixelSize]);</div>
<div class="line"><a id="l00640" name="l00640"></a><span class="lineno">  640</span>                        destinationImage[destinationIndex++] = (byte)(image[startIndex] - image[startIndex++ - pixelSize]);</div>
<div class="line"><a id="l00641" name="l00641"></a><span class="lineno">  641</span>                        destinationImage[destinationIndex++] = (byte)(image[startIndex] - image[startIndex++ - pixelSize]);</div>
<div class="line"><a id="l00642" name="l00642"></a><span class="lineno">  642</span>                        <span class="keywordflow">if</span> (pixelSize == 4)</div>
<div class="line"><a id="l00643" name="l00643"></a><span class="lineno">  643</span>                        {</div>
<div class="line"><a id="l00644" name="l00644"></a><span class="lineno">  644</span>                            destinationImage[destinationIndex++] = (byte)(image[startIndex] - image[startIndex++ - pixelSize]);</div>
<div class="line"><a id="l00645" name="l00645"></a><span class="lineno">  645</span>                        }</div>
<div class="line"><a id="l00646" name="l00646"></a><span class="lineno">  646</span>                    }</div>
<div class="line"><a id="l00647" name="l00647"></a><span class="lineno">  647</span>                    <span class="keywordflow">else</span> <span class="keywordflow">if</span> (x == 0 &amp;&amp; y &gt; 0)</div>
<div class="line"><a id="l00648" name="l00648"></a><span class="lineno">  648</span>                    {</div>
<div class="line"><a id="l00649" name="l00649"></a><span class="lineno">  649</span>                        destinationImage[destinationIndex++] = (byte)(image[startIndex] - image[startIndex++ - stride]);</div>
<div class="line"><a id="l00650" name="l00650"></a><span class="lineno">  650</span>                        destinationImage[destinationIndex++] = (byte)(image[startIndex] - image[startIndex++ - stride]);</div>
<div class="line"><a id="l00651" name="l00651"></a><span class="lineno">  651</span>                        destinationImage[destinationIndex++] = (byte)(image[startIndex] - image[startIndex++ - stride]);</div>
<div class="line"><a id="l00652" name="l00652"></a><span class="lineno">  652</span>                        <span class="keywordflow">if</span> (pixelSize == 4)</div>
<div class="line"><a id="l00653" name="l00653"></a><span class="lineno">  653</span>                        {</div>
<div class="line"><a id="l00654" name="l00654"></a><span class="lineno">  654</span>                            destinationImage[destinationIndex++] = (byte)(image[startIndex] - image[startIndex++ - stride]);</div>
<div class="line"><a id="l00655" name="l00655"></a><span class="lineno">  655</span>                        }</div>
<div class="line"><a id="l00656" name="l00656"></a><span class="lineno">  656</span>                    }</div>
<div class="line"><a id="l00657" name="l00657"></a><span class="lineno">  657</span>                    <span class="keywordflow">else</span></div>
<div class="line"><a id="l00658" name="l00658"></a><span class="lineno">  658</span>                    {</div>
<div class="line"><a id="l00659" name="l00659"></a><span class="lineno">  659</span>                        destinationImage[destinationIndex++] = image[startIndex++];</div>
<div class="line"><a id="l00660" name="l00660"></a><span class="lineno">  660</span>                        destinationImage[destinationIndex++] = image[startIndex++];</div>
<div class="line"><a id="l00661" name="l00661"></a><span class="lineno">  661</span>                        destinationImage[destinationIndex++] = image[startIndex++];</div>
<div class="line"><a id="l00662" name="l00662"></a><span class="lineno">  662</span>                        <span class="keywordflow">if</span> (pixelSize == 4)</div>
<div class="line"><a id="l00663" name="l00663"></a><span class="lineno">  663</span>                        {</div>
<div class="line"><a id="l00664" name="l00664"></a><span class="lineno">  664</span>                            destinationImage[destinationIndex++] = image[startIndex++];</div>
<div class="line"><a id="l00665" name="l00665"></a><span class="lineno">  665</span>                        }</div>
<div class="line"><a id="l00666" name="l00666"></a><span class="lineno">  666</span>                    }</div>
<div class="line"><a id="l00667" name="l00667"></a><span class="lineno">  667</span>                }</div>
<div class="line"><a id="l00668" name="l00668"></a><span class="lineno">  668</span>            }</div>
<div class="line"><a id="l00669" name="l00669"></a><span class="lineno">  669</span>            <span class="keywordflow">else</span> <span class="keywordflow">if</span> (filter == FilterModes.Adaptive)</div>
<div class="line"><a id="l00670" name="l00670"></a><span class="lineno">  670</span>            {</div>
<div class="line"><a id="l00671" name="l00671"></a><span class="lineno">  671</span>                <span class="keywordtype">int</span> tempIndex = 0;</div>
<div class="line"><a id="l00672" name="l00672"></a><span class="lineno">  672</span> </div>
<div class="line"><a id="l00673" name="l00673"></a><span class="lineno">  673</span>                <span class="keywordtype">int</span> none = 0;</div>
<div class="line"><a id="l00674" name="l00674"></a><span class="lineno">  674</span>                <span class="keywordtype">int</span> sub = 0;</div>
<div class="line"><a id="l00675" name="l00675"></a><span class="lineno">  675</span>                <span class="keywordtype">int</span> up = 0;</div>
<div class="line"><a id="l00676" name="l00676"></a><span class="lineno">  676</span>                <span class="keywordtype">int</span> average = 0;</div>
<div class="line"><a id="l00677" name="l00677"></a><span class="lineno">  677</span>                <span class="keywordtype">int</span> paeth = 0;</div>
<div class="line"><a id="l00678" name="l00678"></a><span class="lineno">  678</span> </div>
<div class="line"><a id="l00679" name="l00679"></a><span class="lineno">  679</span>                <span class="keywordflow">for</span> (<span class="keywordtype">int</span> x = 0; x &lt; width; x++)</div>
<div class="line"><a id="l00680" name="l00680"></a><span class="lineno">  680</span>                {</div>
<div class="line"><a id="l00681" name="l00681"></a><span class="lineno">  681</span>                    <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i &lt; pixelSize; i++)</div>
<div class="line"><a id="l00682" name="l00682"></a><span class="lineno">  682</span>                    {</div>
<div class="line"><a id="l00683" name="l00683"></a><span class="lineno">  683</span>                        <span class="comment">//none</span></div>
<div class="line"><a id="l00684" name="l00684"></a><span class="lineno">  684</span>                        tempBuffer[tempIndex] = image[startIndex];</div>
<div class="line"><a id="l00685" name="l00685"></a><span class="lineno">  685</span> </div>
<div class="line"><a id="l00686" name="l00686"></a><span class="lineno">  686</span>                        <span class="comment">//sub</span></div>
<div class="line"><a id="l00687" name="l00687"></a><span class="lineno">  687</span>                        <span class="keywordflow">if</span> (x &gt; 0)</div>
<div class="line"><a id="l00688" name="l00688"></a><span class="lineno">  688</span>                        {</div>
<div class="line"><a id="l00689" name="l00689"></a><span class="lineno">  689</span>                            tempBuffer[tempIndex + stride] = (byte)(image[startIndex] - image[startIndex - pixelSize]);</div>
<div class="line"><a id="l00690" name="l00690"></a><span class="lineno">  690</span>                        }</div>
<div class="line"><a id="l00691" name="l00691"></a><span class="lineno">  691</span>                        <span class="keywordflow">else</span></div>
<div class="line"><a id="l00692" name="l00692"></a><span class="lineno">  692</span>                        {</div>
<div class="line"><a id="l00693" name="l00693"></a><span class="lineno">  693</span>                            tempBuffer[tempIndex + stride] = image[startIndex];</div>
<div class="line"><a id="l00694" name="l00694"></a><span class="lineno">  694</span>                        }</div>
<div class="line"><a id="l00695" name="l00695"></a><span class="lineno">  695</span> </div>
<div class="line"><a id="l00696" name="l00696"></a><span class="lineno">  696</span>                        <span class="comment">//up</span></div>
<div class="line"><a id="l00697" name="l00697"></a><span class="lineno">  697</span>                        <span class="keywordflow">if</span> (y &gt; 0)</div>
<div class="line"><a id="l00698" name="l00698"></a><span class="lineno">  698</span>                        {</div>
<div class="line"><a id="l00699" name="l00699"></a><span class="lineno">  699</span>                            tempBuffer[tempIndex + stride * 2] = (byte)(image[startIndex] - image[startIndex - stride]);</div>
<div class="line"><a id="l00700" name="l00700"></a><span class="lineno">  700</span>                        }</div>
<div class="line"><a id="l00701" name="l00701"></a><span class="lineno">  701</span>                        <span class="keywordflow">else</span></div>
<div class="line"><a id="l00702" name="l00702"></a><span class="lineno">  702</span>                        {</div>
<div class="line"><a id="l00703" name="l00703"></a><span class="lineno">  703</span>                            tempBuffer[tempIndex + stride * 2] = image[startIndex];</div>
<div class="line"><a id="l00704" name="l00704"></a><span class="lineno">  704</span>                        }</div>
<div class="line"><a id="l00705" name="l00705"></a><span class="lineno">  705</span> </div>
<div class="line"><a id="l00706" name="l00706"></a><span class="lineno">  706</span>                        <span class="comment">//average</span></div>
<div class="line"><a id="l00707" name="l00707"></a><span class="lineno">  707</span>                        <span class="keywordflow">if</span> (x &gt; 0 &amp;&amp; y &gt; 0)</div>
<div class="line"><a id="l00708" name="l00708"></a><span class="lineno">  708</span>                        {</div>
<div class="line"><a id="l00709" name="l00709"></a><span class="lineno">  709</span>                            tempBuffer[tempIndex + stride * 3] = (byte)(image[startIndex] - (image[startIndex - pixelSize] + image[startIndex - stride]) / 2);</div>
<div class="line"><a id="l00710" name="l00710"></a><span class="lineno">  710</span>                        }</div>
<div class="line"><a id="l00711" name="l00711"></a><span class="lineno">  711</span>                        <span class="keywordflow">else</span> <span class="keywordflow">if</span> (x &gt; 0 &amp;&amp; y == 0)</div>
<div class="line"><a id="l00712" name="l00712"></a><span class="lineno">  712</span>                        {</div>
<div class="line"><a id="l00713" name="l00713"></a><span class="lineno">  713</span>                            tempBuffer[tempIndex + stride * 3] = (byte)(image[startIndex] - image[startIndex - pixelSize] / 2);</div>
<div class="line"><a id="l00714" name="l00714"></a><span class="lineno">  714</span>                        }</div>
<div class="line"><a id="l00715" name="l00715"></a><span class="lineno">  715</span>                        <span class="keywordflow">else</span> <span class="keywordflow">if</span> (x == 0 &amp;&amp; y &gt; 0)</div>
<div class="line"><a id="l00716" name="l00716"></a><span class="lineno">  716</span>                        {</div>
<div class="line"><a id="l00717" name="l00717"></a><span class="lineno">  717</span>                            tempBuffer[tempIndex + stride * 3] = (byte)(image[startIndex] - image[startIndex - stride] / 2);</div>
<div class="line"><a id="l00718" name="l00718"></a><span class="lineno">  718</span>                        }</div>
<div class="line"><a id="l00719" name="l00719"></a><span class="lineno">  719</span>                        <span class="keywordflow">else</span></div>
<div class="line"><a id="l00720" name="l00720"></a><span class="lineno">  720</span>                        {</div>
<div class="line"><a id="l00721" name="l00721"></a><span class="lineno">  721</span>                            tempBuffer[tempIndex + stride * 3] = image[startIndex];</div>
<div class="line"><a id="l00722" name="l00722"></a><span class="lineno">  722</span>                        }</div>
<div class="line"><a id="l00723" name="l00723"></a><span class="lineno">  723</span> </div>
<div class="line"><a id="l00724" name="l00724"></a><span class="lineno">  724</span>                        <span class="comment">//paeth</span></div>
<div class="line"><a id="l00725" name="l00725"></a><span class="lineno">  725</span>                        <span class="keywordflow">if</span> (x &gt; 0 &amp;&amp; y &gt; 0)</div>
<div class="line"><a id="l00726" name="l00726"></a><span class="lineno">  726</span>                        {</div>
<div class="line"><a id="l00727" name="l00727"></a><span class="lineno">  727</span>                            tempBuffer[tempIndex + stride * 4] = (byte)(image[startIndex] - PaethPredictor(image[startIndex - pixelSize], image[startIndex - stride], image[startIndex - pixelSize - stride]));</div>
<div class="line"><a id="l00728" name="l00728"></a><span class="lineno">  728</span>                        }</div>
<div class="line"><a id="l00729" name="l00729"></a><span class="lineno">  729</span>                        <span class="keywordflow">else</span> <span class="keywordflow">if</span> (x &gt; 0 &amp;&amp; y == 0)</div>
<div class="line"><a id="l00730" name="l00730"></a><span class="lineno">  730</span>                        {</div>
<div class="line"><a id="l00731" name="l00731"></a><span class="lineno">  731</span>                            tempBuffer[tempIndex + stride * 4] = (byte)(image[startIndex] - image[startIndex - pixelSize]);</div>
<div class="line"><a id="l00732" name="l00732"></a><span class="lineno">  732</span>                        }</div>
<div class="line"><a id="l00733" name="l00733"></a><span class="lineno">  733</span>                        <span class="keywordflow">else</span> <span class="keywordflow">if</span> (x == 0 &amp;&amp; y &gt; 0)</div>
<div class="line"><a id="l00734" name="l00734"></a><span class="lineno">  734</span>                        {</div>
<div class="line"><a id="l00735" name="l00735"></a><span class="lineno">  735</span>                            tempBuffer[tempIndex + stride * 4] = (byte)(image[startIndex] - image[startIndex - stride]);</div>
<div class="line"><a id="l00736" name="l00736"></a><span class="lineno">  736</span>                        }</div>
<div class="line"><a id="l00737" name="l00737"></a><span class="lineno">  737</span>                        <span class="keywordflow">else</span></div>
<div class="line"><a id="l00738" name="l00738"></a><span class="lineno">  738</span>                        {</div>
<div class="line"><a id="l00739" name="l00739"></a><span class="lineno">  739</span>                            tempBuffer[tempIndex + stride * 4] = image[startIndex];</div>
<div class="line"><a id="l00740" name="l00740"></a><span class="lineno">  740</span>                        }</div>
<div class="line"><a id="l00741" name="l00741"></a><span class="lineno">  741</span> </div>
<div class="line"><a id="l00742" name="l00742"></a><span class="lineno">  742</span>                        none += tempBuffer[tempIndex];</div>
<div class="line"><a id="l00743" name="l00743"></a><span class="lineno">  743</span>                        sub += tempBuffer[tempIndex + stride];</div>
<div class="line"><a id="l00744" name="l00744"></a><span class="lineno">  744</span>                        up += tempBuffer[tempIndex + stride * 2];</div>
<div class="line"><a id="l00745" name="l00745"></a><span class="lineno">  745</span>                        average += tempBuffer[tempIndex + stride * 3];</div>
<div class="line"><a id="l00746" name="l00746"></a><span class="lineno">  746</span>                        paeth += tempBuffer[tempIndex + stride * 4];</div>
<div class="line"><a id="l00747" name="l00747"></a><span class="lineno">  747</span>                        tempIndex++;</div>
<div class="line"><a id="l00748" name="l00748"></a><span class="lineno">  748</span>                        startIndex++;</div>
<div class="line"><a id="l00749" name="l00749"></a><span class="lineno">  749</span>                    }</div>
<div class="line"><a id="l00750" name="l00750"></a><span class="lineno">  750</span>                }</div>
<div class="line"><a id="l00751" name="l00751"></a><span class="lineno">  751</span> </div>
<div class="line"><a id="l00752" name="l00752"></a><span class="lineno">  752</span>                <span class="keywordflow">if</span> (paeth &lt;= average &amp;&amp; paeth &lt;= up &amp;&amp; paeth &lt;= sub &amp;&amp; paeth &lt;= none)</div>
<div class="line"><a id="l00753" name="l00753"></a><span class="lineno">  753</span>                {</div>
<div class="line"><a id="l00754" name="l00754"></a><span class="lineno">  754</span>                    destinationImage[destinationIndex++] = 4;</div>
<div class="line"><a id="l00755" name="l00755"></a><span class="lineno">  755</span>                    tempIndex = stride * 4;</div>
<div class="line"><a id="l00756" name="l00756"></a><span class="lineno">  756</span>                    <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i &lt; stride; i++)</div>
<div class="line"><a id="l00757" name="l00757"></a><span class="lineno">  757</span>                    {</div>
<div class="line"><a id="l00758" name="l00758"></a><span class="lineno">  758</span>                        destinationImage[destinationIndex++] = tempBuffer[tempIndex++];</div>
<div class="line"><a id="l00759" name="l00759"></a><span class="lineno">  759</span>                    }</div>
<div class="line"><a id="l00760" name="l00760"></a><span class="lineno">  760</span>                }</div>
<div class="line"><a id="l00761" name="l00761"></a><span class="lineno">  761</span>                <span class="keywordflow">else</span> <span class="keywordflow">if</span> (average &lt;= up &amp;&amp; average &lt;= sub &amp;&amp; average &lt;= none)</div>
<div class="line"><a id="l00762" name="l00762"></a><span class="lineno">  762</span>                {</div>
<div class="line"><a id="l00763" name="l00763"></a><span class="lineno">  763</span>                    destinationImage[destinationIndex++] = 3;</div>
<div class="line"><a id="l00764" name="l00764"></a><span class="lineno">  764</span>                    tempIndex = stride * 3;</div>
<div class="line"><a id="l00765" name="l00765"></a><span class="lineno">  765</span>                    <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i &lt; stride; i++)</div>
<div class="line"><a id="l00766" name="l00766"></a><span class="lineno">  766</span>                    {</div>
<div class="line"><a id="l00767" name="l00767"></a><span class="lineno">  767</span>                        destinationImage[destinationIndex++] = tempBuffer[tempIndex++];</div>
<div class="line"><a id="l00768" name="l00768"></a><span class="lineno">  768</span>                    }</div>
<div class="line"><a id="l00769" name="l00769"></a><span class="lineno">  769</span>                }</div>
<div class="line"><a id="l00770" name="l00770"></a><span class="lineno">  770</span>                <span class="keywordflow">else</span> <span class="keywordflow">if</span> (up &lt;= sub &amp;&amp; up &lt;= none)</div>
<div class="line"><a id="l00771" name="l00771"></a><span class="lineno">  771</span>                {</div>
<div class="line"><a id="l00772" name="l00772"></a><span class="lineno">  772</span>                    destinationImage[destinationIndex++] = 2;</div>
<div class="line"><a id="l00773" name="l00773"></a><span class="lineno">  773</span>                    tempIndex = stride * 2;</div>
<div class="line"><a id="l00774" name="l00774"></a><span class="lineno">  774</span>                    <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i &lt; stride; i++)</div>
<div class="line"><a id="l00775" name="l00775"></a><span class="lineno">  775</span>                    {</div>
<div class="line"><a id="l00776" name="l00776"></a><span class="lineno">  776</span>                        destinationImage[destinationIndex++] = tempBuffer[tempIndex++];</div>
<div class="line"><a id="l00777" name="l00777"></a><span class="lineno">  777</span>                    }</div>
<div class="line"><a id="l00778" name="l00778"></a><span class="lineno">  778</span>                }</div>
<div class="line"><a id="l00779" name="l00779"></a><span class="lineno">  779</span>                <span class="keywordflow">else</span> <span class="keywordflow">if</span> (sub &lt;= none)</div>
<div class="line"><a id="l00780" name="l00780"></a><span class="lineno">  780</span>                {</div>
<div class="line"><a id="l00781" name="l00781"></a><span class="lineno">  781</span>                    destinationImage[destinationIndex++] = 1;</div>
<div class="line"><a id="l00782" name="l00782"></a><span class="lineno">  782</span>                    tempIndex = stride;</div>
<div class="line"><a id="l00783" name="l00783"></a><span class="lineno">  783</span>                    <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i &lt; stride; i++)</div>
<div class="line"><a id="l00784" name="l00784"></a><span class="lineno">  784</span>                    {</div>
<div class="line"><a id="l00785" name="l00785"></a><span class="lineno">  785</span>                        destinationImage[destinationIndex++] = tempBuffer[tempIndex++];</div>
<div class="line"><a id="l00786" name="l00786"></a><span class="lineno">  786</span>                    }</div>
<div class="line"><a id="l00787" name="l00787"></a><span class="lineno">  787</span>                }</div>
<div class="line"><a id="l00788" name="l00788"></a><span class="lineno">  788</span>                <span class="keywordflow">else</span></div>
<div class="line"><a id="l00789" name="l00789"></a><span class="lineno">  789</span>                {</div>
<div class="line"><a id="l00790" name="l00790"></a><span class="lineno">  790</span>                    destinationImage[destinationIndex++] = 0;</div>
<div class="line"><a id="l00791" name="l00791"></a><span class="lineno">  791</span>                    tempIndex = 0;</div>
<div class="line"><a id="l00792" name="l00792"></a><span class="lineno">  792</span>                    <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i &lt; stride; i++)</div>
<div class="line"><a id="l00793" name="l00793"></a><span class="lineno">  793</span>                    {</div>
<div class="line"><a id="l00794" name="l00794"></a><span class="lineno">  794</span>                        destinationImage[destinationIndex++] = tempBuffer[tempIndex++];</div>
<div class="line"><a id="l00795" name="l00795"></a><span class="lineno">  795</span>                    }</div>
<div class="line"><a id="l00796" name="l00796"></a><span class="lineno">  796</span>                }</div>
<div class="line"><a id="l00797" name="l00797"></a><span class="lineno">  797</span>            }</div>
<div class="line"><a id="l00798" name="l00798"></a><span class="lineno">  798</span>        }</div>
<div class="line"><a id="l00799" name="l00799"></a><span class="lineno">  799</span> </div>
<div class="line"><a id="l00800" name="l00800"></a><span class="lineno">  800</span>        <span class="keyword">internal</span> unsafe <span class="keyword">static</span> IntPtr FilterImageData(<span class="keywordtype">byte</span>* image, <span class="keywordtype">int</span> width, <span class="keywordtype">int</span> height, <span class="keywordtype">int</span> pixelSize, FilterModes filter)</div>
<div class="line"><a id="l00801" name="l00801"></a><span class="lineno">  801</span>        {</div>
<div class="line"><a id="l00802" name="l00802"></a><span class="lineno">  802</span>            IntPtr filteredMemory = Marshal.AllocHGlobal(height * (1 + width * pixelSize));</div>
<div class="line"><a id="l00803" name="l00803"></a><span class="lineno">  803</span> </div>
<div class="line"><a id="l00804" name="l00804"></a><span class="lineno">  804</span>            IntPtr tempBuffer;</div>
<div class="line"><a id="l00805" name="l00805"></a><span class="lineno">  805</span> </div>
<div class="line"><a id="l00806" name="l00806"></a><span class="lineno">  806</span>            <span class="keywordflow">if</span> (filter == FilterModes.Adaptive)</div>
<div class="line"><a id="l00807" name="l00807"></a><span class="lineno">  807</span>            {</div>
<div class="line"><a id="l00808" name="l00808"></a><span class="lineno">  808</span>                tempBuffer = Marshal.AllocHGlobal(5 * width * pixelSize);</div>
<div class="line"><a id="l00809" name="l00809"></a><span class="lineno">  809</span>            }</div>
<div class="line"><a id="l00810" name="l00810"></a><span class="lineno">  810</span>            <span class="keywordflow">else</span></div>
<div class="line"><a id="l00811" name="l00811"></a><span class="lineno">  811</span>            {</div>
<div class="line"><a id="l00812" name="l00812"></a><span class="lineno">  812</span>                tempBuffer = IntPtr.Zero;</div>
<div class="line"><a id="l00813" name="l00813"></a><span class="lineno">  813</span>            }</div>
<div class="line"><a id="l00814" name="l00814"></a><span class="lineno">  814</span> </div>
<div class="line"><a id="l00815" name="l00815"></a><span class="lineno">  815</span>            <span class="keywordtype">int</span> stride = width * pixelSize;</div>
<div class="line"><a id="l00816" name="l00816"></a><span class="lineno">  816</span> </div>
<div class="line"><a id="l00817" name="l00817"></a><span class="lineno">  817</span>            <span class="keywordtype">byte</span>* filteredPointer = (<span class="keywordtype">byte</span>*)filteredMemory;</div>
<div class="line"><a id="l00818" name="l00818"></a><span class="lineno">  818</span> </div>
<div class="line"><a id="l00819" name="l00819"></a><span class="lineno">  819</span>            <span class="keywordtype">byte</span>* tempPointer = (<span class="keywordtype">byte</span>*)tempBuffer;</div>
<div class="line"><a id="l00820" name="l00820"></a><span class="lineno">  820</span> </div>
<div class="line"><a id="l00821" name="l00821"></a><span class="lineno">  821</span>            <span class="keywordflow">for</span> (<span class="keywordtype">int</span> y = 0; y &lt; height; y++)</div>
<div class="line"><a id="l00822" name="l00822"></a><span class="lineno">  822</span>            {</div>
<div class="line"><a id="l00823" name="l00823"></a><span class="lineno">  823</span>                FilterRow(image, width, pixelSize, stride, y, filter, filteredPointer, tempPointer);</div>
<div class="line"><a id="l00824" name="l00824"></a><span class="lineno">  824</span>            }</div>
<div class="line"><a id="l00825" name="l00825"></a><span class="lineno">  825</span> </div>
<div class="line"><a id="l00826" name="l00826"></a><span class="lineno">  826</span>            Marshal.FreeHGlobal(tempBuffer);</div>
<div class="line"><a id="l00827" name="l00827"></a><span class="lineno">  827</span> </div>
<div class="line"><a id="l00828" name="l00828"></a><span class="lineno">  828</span>            <span class="keywordflow">return</span> filteredMemory;</div>
<div class="line"><a id="l00829" name="l00829"></a><span class="lineno">  829</span>        }</div>
<div class="line"><a id="l00830" name="l00830"></a><span class="lineno">  830</span> </div>
<div class="line"><a id="l00831" name="l00831"></a><span class="lineno">  831</span>        <span class="keyword">internal</span> unsafe <span class="keyword">static</span> IntPtr FilterImageData(<span class="keywordtype">byte</span>* image, <span class="keywordtype">int</span> width, <span class="keywordtype">int</span> height, <span class="keywordtype">int</span> pixelSize, FilterModes filter, <span class="keywordtype">int</span> threadCount)</div>
<div class="line"><a id="l00832" name="l00832"></a><span class="lineno">  832</span>        {</div>
<div class="line"><a id="l00833" name="l00833"></a><span class="lineno">  833</span>            threadCount = Math.Min(threadCount, height);</div>
<div class="line"><a id="l00834" name="l00834"></a><span class="lineno">  834</span> </div>
<div class="line"><a id="l00835" name="l00835"></a><span class="lineno">  835</span>            IntPtr filteredMemory = Marshal.AllocHGlobal(height * (1 + width * pixelSize));</div>
<div class="line"><a id="l00836" name="l00836"></a><span class="lineno">  836</span> </div>
<div class="line"><a id="l00837" name="l00837"></a><span class="lineno">  837</span>            <span class="keywordtype">int</span> stride = width * pixelSize;</div>
<div class="line"><a id="l00838" name="l00838"></a><span class="lineno">  838</span> </div>
<div class="line"><a id="l00839" name="l00839"></a><span class="lineno">  839</span>            <span class="keywordtype">byte</span>* filteredPointer = (<span class="keywordtype">byte</span>*)filteredMemory;</div>
<div class="line"><a id="l00840" name="l00840"></a><span class="lineno">  840</span> </div>
<div class="line"><a id="l00841" name="l00841"></a><span class="lineno">  841</span>            IntPtr[] tempBuffers = <span class="keyword">new</span> IntPtr[threadCount];</div>
<div class="line"><a id="l00842" name="l00842"></a><span class="lineno">  842</span> </div>
<div class="line"><a id="l00843" name="l00843"></a><span class="lineno">  843</span>            Thread[] threads = <span class="keyword">new</span> Thread[threadCount];</div>
<div class="line"><a id="l00844" name="l00844"></a><span class="lineno">  844</span>            <span class="keywordtype">int</span>[] rowsByThread = <span class="keyword">new</span> <span class="keywordtype">int</span>[threadCount];</div>
<div class="line"><a id="l00845" name="l00845"></a><span class="lineno">  845</span>            EventWaitHandle[] signalsFromThreads = <span class="keyword">new</span> EventWaitHandle[threadCount];</div>
<div class="line"><a id="l00846" name="l00846"></a><span class="lineno">  846</span>            EventWaitHandle[] signalsToThreads = <span class="keyword">new</span> EventWaitHandle[threadCount];</div>
<div class="line"><a id="l00847" name="l00847"></a><span class="lineno">  847</span> </div>
<div class="line"><a id="l00848" name="l00848"></a><span class="lineno">  848</span>            <span class="keywordtype">int</span> firstNeededRow = threadCount;</div>
<div class="line"><a id="l00849" name="l00849"></a><span class="lineno">  849</span> </div>
<div class="line"><a id="l00850" name="l00850"></a><span class="lineno">  850</span>            <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i &lt; threadCount; i++)</div>
<div class="line"><a id="l00851" name="l00851"></a><span class="lineno">  851</span>            {</div>
<div class="line"><a id="l00852" name="l00852"></a><span class="lineno">  852</span>                rowsByThread[i] = i;</div>
<div class="line"><a id="l00853" name="l00853"></a><span class="lineno">  853</span>                signalsFromThreads[i] = <span class="keyword">new</span> EventWaitHandle(<span class="keyword">false</span>, EventResetMode.ManualReset);</div>
<div class="line"><a id="l00854" name="l00854"></a><span class="lineno">  854</span>                signalsToThreads[i] = <span class="keyword">new</span> EventWaitHandle(<span class="keyword">false</span>, EventResetMode.ManualReset);</div>
<div class="line"><a id="l00855" name="l00855"></a><span class="lineno">  855</span> </div>
<div class="line"><a id="l00856" name="l00856"></a><span class="lineno">  856</span>                <span class="keywordflow">if</span> (filter == FilterModes.Adaptive)</div>
<div class="line"><a id="l00857" name="l00857"></a><span class="lineno">  857</span>                {</div>
<div class="line"><a id="l00858" name="l00858"></a><span class="lineno">  858</span>                    tempBuffers[i] = Marshal.AllocHGlobal(5 * width * pixelSize);</div>
<div class="line"><a id="l00859" name="l00859"></a><span class="lineno">  859</span>                }</div>
<div class="line"><a id="l00860" name="l00860"></a><span class="lineno">  860</span>                <span class="keywordflow">else</span></div>
<div class="line"><a id="l00861" name="l00861"></a><span class="lineno">  861</span>                {</div>
<div class="line"><a id="l00862" name="l00862"></a><span class="lineno">  862</span>                    tempBuffers[i] = IntPtr.Zero;</div>
<div class="line"><a id="l00863" name="l00863"></a><span class="lineno">  863</span>                }</div>
<div class="line"><a id="l00864" name="l00864"></a><span class="lineno">  864</span> </div>
<div class="line"><a id="l00865" name="l00865"></a><span class="lineno">  865</span>                <span class="keywordtype">byte</span>* tempPointer = (<span class="keywordtype">byte</span>*)tempBuffers[i];</div>
<div class="line"><a id="l00866" name="l00866"></a><span class="lineno">  866</span> </div>
<div class="line"><a id="l00867" name="l00867"></a><span class="lineno">  867</span>                <span class="keywordtype">int</span> threadIndex = i;</div>
<div class="line"><a id="l00868" name="l00868"></a><span class="lineno">  868</span> </div>
<div class="line"><a id="l00869" name="l00869"></a><span class="lineno">  869</span>                threads[i] = <span class="keyword">new</span> Thread(() =&gt;</div>
<div class="line"><a id="l00870" name="l00870"></a><span class="lineno">  870</span>                {</div>
<div class="line"><a id="l00871" name="l00871"></a><span class="lineno">  871</span>                    <span class="keywordflow">while</span> (rowsByThread[threadIndex] &gt;= 0)</div>
<div class="line"><a id="l00872" name="l00872"></a><span class="lineno">  872</span>                    {</div>
<div class="line"><a id="l00873" name="l00873"></a><span class="lineno">  873</span>                        FilterRow(image, width, pixelSize, stride, rowsByThread[threadIndex], filter, filteredPointer, tempPointer);</div>
<div class="line"><a id="l00874" name="l00874"></a><span class="lineno">  874</span>                        EventWaitHandle.SignalAndWait(signalsFromThreads[threadIndex], signalsToThreads[threadIndex]);</div>
<div class="line"><a id="l00875" name="l00875"></a><span class="lineno">  875</span>                        signalsToThreads[threadIndex].Reset();</div>
<div class="line"><a id="l00876" name="l00876"></a><span class="lineno">  876</span>                    }</div>
<div class="line"><a id="l00877" name="l00877"></a><span class="lineno">  877</span>                });</div>
<div class="line"><a id="l00878" name="l00878"></a><span class="lineno">  878</span>            }</div>
<div class="line"><a id="l00879" name="l00879"></a><span class="lineno">  879</span> </div>
<div class="line"><a id="l00880" name="l00880"></a><span class="lineno">  880</span>            <span class="keywordtype">int</span> finished = 0;</div>
<div class="line"><a id="l00881" name="l00881"></a><span class="lineno">  881</span> </div>
<div class="line"><a id="l00882" name="l00882"></a><span class="lineno">  882</span>            <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i &lt; threadCount; i++)</div>
<div class="line"><a id="l00883" name="l00883"></a><span class="lineno">  883</span>            {</div>
<div class="line"><a id="l00884" name="l00884"></a><span class="lineno">  884</span>                threads[i].Start();</div>
<div class="line"><a id="l00885" name="l00885"></a><span class="lineno">  885</span>            }</div>
<div class="line"><a id="l00886" name="l00886"></a><span class="lineno">  886</span> </div>
<div class="line"><a id="l00887" name="l00887"></a><span class="lineno">  887</span>            <span class="keywordflow">while</span> (finished &lt; threadCount)</div>
<div class="line"><a id="l00888" name="l00888"></a><span class="lineno">  888</span>            {</div>
<div class="line"><a id="l00889" name="l00889"></a><span class="lineno">  889</span>                <span class="keywordtype">int</span> threadInd = EventWaitHandle.WaitAny(signalsFromThreads);</div>
<div class="line"><a id="l00890" name="l00890"></a><span class="lineno">  890</span> </div>
<div class="line"><a id="l00891" name="l00891"></a><span class="lineno">  891</span>                signalsFromThreads[threadInd].Reset();</div>
<div class="line"><a id="l00892" name="l00892"></a><span class="lineno">  892</span> </div>
<div class="line"><a id="l00893" name="l00893"></a><span class="lineno">  893</span>                <span class="keywordflow">if</span> (firstNeededRow &lt; height)</div>
<div class="line"><a id="l00894" name="l00894"></a><span class="lineno">  894</span>                {</div>
<div class="line"><a id="l00895" name="l00895"></a><span class="lineno">  895</span>                    rowsByThread[threadInd] = firstNeededRow;</div>
<div class="line"><a id="l00896" name="l00896"></a><span class="lineno">  896</span>                    firstNeededRow++;</div>
<div class="line"><a id="l00897" name="l00897"></a><span class="lineno">  897</span>                    signalsToThreads[threadInd].Set();</div>
<div class="line"><a id="l00898" name="l00898"></a><span class="lineno">  898</span>                }</div>
<div class="line"><a id="l00899" name="l00899"></a><span class="lineno">  899</span>                <span class="keywordflow">else</span></div>
<div class="line"><a id="l00900" name="l00900"></a><span class="lineno">  900</span>                {</div>
<div class="line"><a id="l00901" name="l00901"></a><span class="lineno">  901</span>                    rowsByThread[threadInd] = -1;</div>
<div class="line"><a id="l00902" name="l00902"></a><span class="lineno">  902</span>                    signalsToThreads[threadInd].Set();</div>
<div class="line"><a id="l00903" name="l00903"></a><span class="lineno">  903</span>                    finished++;</div>
<div class="line"><a id="l00904" name="l00904"></a><span class="lineno">  904</span>                }</div>
<div class="line"><a id="l00905" name="l00905"></a><span class="lineno">  905</span>            }</div>
<div class="line"><a id="l00906" name="l00906"></a><span class="lineno">  906</span> </div>
<div class="line"><a id="l00907" name="l00907"></a><span class="lineno">  907</span>            <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i &lt; threadCount; i++)</div>
<div class="line"><a id="l00908" name="l00908"></a><span class="lineno">  908</span>            {</div>
<div class="line"><a id="l00909" name="l00909"></a><span class="lineno">  909</span>                <span class="keywordflow">if</span> (filter == FilterModes.Adaptive)</div>
<div class="line"><a id="l00910" name="l00910"></a><span class="lineno">  910</span>                {</div>
<div class="line"><a id="l00911" name="l00911"></a><span class="lineno">  911</span>                    Marshal.FreeHGlobal(tempBuffers[i]);</div>
<div class="line"><a id="l00912" name="l00912"></a><span class="lineno">  912</span>                }</div>
<div class="line"><a id="l00913" name="l00913"></a><span class="lineno">  913</span>            }</div>
<div class="line"><a id="l00914" name="l00914"></a><span class="lineno">  914</span> </div>
<div class="line"><a id="l00915" name="l00915"></a><span class="lineno">  915</span>            <span class="keywordflow">return</span> filteredMemory;</div>
<div class="line"><a id="l00916" name="l00916"></a><span class="lineno">  916</span>        }</div>
<div class="line"><a id="l00917" name="l00917"></a><span class="lineno">  917</span> </div>
<div class="line"><a id="l00918" name="l00918"></a><span class="lineno">  918</span>        <span class="comment">//Based on http://www.libpng.org/pub/png/spec/1.2/PNG-Filters.html</span></div>
<div class="line"><a id="l00919" name="l00919"></a><span class="lineno">  919</span>        <span class="keyword">internal</span> <span class="keyword">static</span> <span class="keywordtype">byte</span> PaethPredictor(<span class="keywordtype">byte</span> a, <span class="keywordtype">byte</span> b, <span class="keywordtype">byte</span> c)</div>
<div class="line"><a id="l00920" name="l00920"></a><span class="lineno">  920</span>        {</div>
<div class="line"><a id="l00921" name="l00921"></a><span class="lineno">  921</span>            <span class="keywordtype">int</span> p = (int)a + (<span class="keywordtype">int</span>)b - (int)c;</div>
<div class="line"><a id="l00922" name="l00922"></a><span class="lineno">  922</span>            <span class="keywordtype">int</span> pa = Math.Abs(p - (<span class="keywordtype">int</span>)a);</div>
<div class="line"><a id="l00923" name="l00923"></a><span class="lineno">  923</span>            <span class="keywordtype">int</span> pb = Math.Abs(p - (<span class="keywordtype">int</span>)b);</div>
<div class="line"><a id="l00924" name="l00924"></a><span class="lineno">  924</span>            <span class="keywordtype">int</span> pc = Math.Abs(p - (<span class="keywordtype">int</span>)c);</div>
<div class="line"><a id="l00925" name="l00925"></a><span class="lineno">  925</span> </div>
<div class="line"><a id="l00926" name="l00926"></a><span class="lineno">  926</span>            <span class="keywordflow">if</span> (pa &lt;= pb &amp;&amp; pa &lt;= pc)</div>
<div class="line"><a id="l00927" name="l00927"></a><span class="lineno">  927</span>            {</div>
<div class="line"><a id="l00928" name="l00928"></a><span class="lineno">  928</span>                <span class="keywordflow">return</span> a;</div>
<div class="line"><a id="l00929" name="l00929"></a><span class="lineno">  929</span>            }</div>
<div class="line"><a id="l00930" name="l00930"></a><span class="lineno">  930</span>            <span class="keywordflow">else</span> <span class="keywordflow">if</span> (pb &lt;= pc)</div>
<div class="line"><a id="l00931" name="l00931"></a><span class="lineno">  931</span>            {</div>
<div class="line"><a id="l00932" name="l00932"></a><span class="lineno">  932</span>                <span class="keywordflow">return</span> b;</div>
<div class="line"><a id="l00933" name="l00933"></a><span class="lineno">  933</span>            }</div>
<div class="line"><a id="l00934" name="l00934"></a><span class="lineno">  934</span>            <span class="keywordflow">else</span></div>
<div class="line"><a id="l00935" name="l00935"></a><span class="lineno">  935</span>            {</div>
<div class="line"><a id="l00936" name="l00936"></a><span class="lineno">  936</span>                <span class="keywordflow">return</span> c;</div>
<div class="line"><a id="l00937" name="l00937"></a><span class="lineno">  937</span>            }</div>
<div class="line"><a id="l00938" name="l00938"></a><span class="lineno">  938</span>        }</div>
<div class="line"><a id="l00939" name="l00939"></a><span class="lineno">  939</span>    }</div>
<div class="line"><a id="l00940" name="l00940"></a><span class="lineno">  940</span> </div>
<div class="line"><a id="l00941" name="l00941"></a><span class="lineno">  941</span>    <span class="comment">//Derived from http://www.libpng.org/pub/png/spec/1.2/PNG-CRCAppendix.html</span></div>
<div class="line"><a id="l00942" name="l00942"></a><span class="lineno">  942</span>    <span class="keyword">internal</span> <span class="keyword">static</span> <span class="keyword">class </span>CRC32</div>
<div class="line"><a id="l00943" name="l00943"></a><span class="lineno">  943</span>    {</div>
<div class="line"><a id="l00944" name="l00944"></a><span class="lineno">  944</span>        <span class="comment">/* Table of CRCs of all 8-bit messages. */</span></div>
<div class="line"><a id="l00945" name="l00945"></a><span class="lineno">  945</span>        <span class="keyword">private</span> <span class="keyword">static</span> readonly uint[] crc_table = <span class="keyword">new</span> uint[256];</div>
<div class="line"><a id="l00946" name="l00946"></a><span class="lineno">  946</span> </div>
<div class="line"><a id="l00947" name="l00947"></a><span class="lineno">  947</span>        <span class="comment">/* Flag: has the table been computed? Initially false. */</span></div>
<div class="line"><a id="l00948" name="l00948"></a><span class="lineno">  948</span>        <span class="keyword">private</span> <span class="keyword">static</span> <span class="keywordtype">bool</span> crc_table_computed = <span class="keyword">false</span>;</div>
<div class="line"><a id="l00949" name="l00949"></a><span class="lineno">  949</span> </div>
<div class="line"><a id="l00950" name="l00950"></a><span class="lineno">  950</span>        <span class="comment">/* Make the table for a fast CRC. */</span></div>
<div class="line"><a id="l00951" name="l00951"></a><span class="lineno">  951</span>        <span class="keyword">private</span> <span class="keyword">static</span> <span class="keywordtype">void</span> MakeCRCtable()</div>
<div class="line"><a id="l00952" name="l00952"></a><span class="lineno">  952</span>        {</div>
<div class="line"><a id="l00953" name="l00953"></a><span class="lineno">  953</span>            uint c;</div>
<div class="line"><a id="l00954" name="l00954"></a><span class="lineno">  954</span>            <span class="keywordtype">int</span> n, k;</div>
<div class="line"><a id="l00955" name="l00955"></a><span class="lineno">  955</span> </div>
<div class="line"><a id="l00956" name="l00956"></a><span class="lineno">  956</span>            <span class="keywordflow">for</span> (n = 0; n &lt; 256; n++)</div>
<div class="line"><a id="l00957" name="l00957"></a><span class="lineno">  957</span>            {</div>
<div class="line"><a id="l00958" name="l00958"></a><span class="lineno">  958</span>                c = (uint)n;</div>
<div class="line"><a id="l00959" name="l00959"></a><span class="lineno">  959</span>                <span class="keywordflow">for</span> (k = 0; k &lt; 8; k++)</div>
<div class="line"><a id="l00960" name="l00960"></a><span class="lineno">  960</span>                {</div>
<div class="line"><a id="l00961" name="l00961"></a><span class="lineno">  961</span>                    <span class="keywordflow">if</span> ((c &amp; 1) != 0)</div>
<div class="line"><a id="l00962" name="l00962"></a><span class="lineno">  962</span>                    {</div>
<div class="line"><a id="l00963" name="l00963"></a><span class="lineno">  963</span>                        c = 0xedb88320 ^ (c &gt;&gt; 1);</div>
<div class="line"><a id="l00964" name="l00964"></a><span class="lineno">  964</span>                    }</div>
<div class="line"><a id="l00965" name="l00965"></a><span class="lineno">  965</span>                    <span class="keywordflow">else</span></div>
<div class="line"><a id="l00966" name="l00966"></a><span class="lineno">  966</span>                    {</div>
<div class="line"><a id="l00967" name="l00967"></a><span class="lineno">  967</span>                        c &gt;&gt;= 1;</div>
<div class="line"><a id="l00968" name="l00968"></a><span class="lineno">  968</span>                    }</div>
<div class="line"><a id="l00969" name="l00969"></a><span class="lineno">  969</span>                }</div>
<div class="line"><a id="l00970" name="l00970"></a><span class="lineno">  970</span>                crc_table[n] = c;</div>
<div class="line"><a id="l00971" name="l00971"></a><span class="lineno">  971</span>            }</div>
<div class="line"><a id="l00972" name="l00972"></a><span class="lineno">  972</span>            crc_table_computed = <span class="keyword">true</span>;</div>
<div class="line"><a id="l00973" name="l00973"></a><span class="lineno">  973</span>        }</div>
<div class="line"><a id="l00974" name="l00974"></a><span class="lineno">  974</span> </div>
<div class="line"><a id="l00975" name="l00975"></a><span class="lineno">  975</span>        <span class="comment">/* Update a running CRC with the bytes buf[0..len-1]--the CRC</span></div>
<div class="line"><a id="l00976" name="l00976"></a><span class="lineno">  976</span><span class="comment">           should be initialized to all 1&#39;s, and the transmitted value</span></div>
<div class="line"><a id="l00977" name="l00977"></a><span class="lineno">  977</span><span class="comment">           is the 1&#39;s complement of the final running CRC (see the</span></div>
<div class="line"><a id="l00978" name="l00978"></a><span class="lineno">  978</span><span class="comment">           crc() routine below)). */</span></div>
<div class="line"><a id="l00979" name="l00979"></a><span class="lineno">  979</span> </div>
<div class="line"><a id="l00980" name="l00980"></a><span class="lineno">  980</span>        <span class="keyword">private</span> <span class="keyword">static</span> uint UpdateCRC(uint crc, Stream buf)</div>
<div class="line"><a id="l00981" name="l00981"></a><span class="lineno">  981</span>        {</div>
<div class="line"><a id="l00982" name="l00982"></a><span class="lineno">  982</span>            uint c = crc;</div>
<div class="line"><a id="l00983" name="l00983"></a><span class="lineno">  983</span>            <span class="keywordtype">int</span> n;</div>
<div class="line"><a id="l00984" name="l00984"></a><span class="lineno">  984</span> </div>
<div class="line"><a id="l00985" name="l00985"></a><span class="lineno">  985</span>            <span class="keywordflow">if</span> (!crc_table_computed)</div>
<div class="line"><a id="l00986" name="l00986"></a><span class="lineno">  986</span>            {</div>
<div class="line"><a id="l00987" name="l00987"></a><span class="lineno">  987</span>                MakeCRCtable();</div>
<div class="line"><a id="l00988" name="l00988"></a><span class="lineno">  988</span>            }</div>
<div class="line"><a id="l00989" name="l00989"></a><span class="lineno">  989</span> </div>
<div class="line"><a id="l00990" name="l00990"></a><span class="lineno">  990</span>            buf.Seek(0, SeekOrigin.Begin);</div>
<div class="line"><a id="l00991" name="l00991"></a><span class="lineno">  991</span> </div>
<div class="line"><a id="l00992" name="l00992"></a><span class="lineno">  992</span>            <span class="keywordflow">for</span> (n = 0; n &lt; buf.Length; n++)</div>
<div class="line"><a id="l00993" name="l00993"></a><span class="lineno">  993</span>            {</div>
<div class="line"><a id="l00994" name="l00994"></a><span class="lineno">  994</span>                c = crc_table[(c ^ (byte)buf.ReadByte()) &amp; 0xff] ^ (c &gt;&gt; 8);</div>
<div class="line"><a id="l00995" name="l00995"></a><span class="lineno">  995</span>            }</div>
<div class="line"><a id="l00996" name="l00996"></a><span class="lineno">  996</span>            <span class="keywordflow">return</span> c;</div>
<div class="line"><a id="l00997" name="l00997"></a><span class="lineno">  997</span>        }</div>
<div class="line"><a id="l00998" name="l00998"></a><span class="lineno">  998</span> </div>
<div class="line"><a id="l00999" name="l00999"></a><span class="lineno">  999</span>        <span class="keyword">private</span> <span class="keyword">static</span> uint UpdateCRC(uint crc, <span class="keywordtype">byte</span>[] buf, <span class="keywordtype">int</span> length)</div>
<div class="line"><a id="l01000" name="l01000"></a><span class="lineno"> 1000</span>        {</div>
<div class="line"><a id="l01001" name="l01001"></a><span class="lineno"> 1001</span>            uint c = crc;</div>
<div class="line"><a id="l01002" name="l01002"></a><span class="lineno"> 1002</span>            <span class="keywordtype">int</span> n;</div>
<div class="line"><a id="l01003" name="l01003"></a><span class="lineno"> 1003</span> </div>
<div class="line"><a id="l01004" name="l01004"></a><span class="lineno"> 1004</span>            <span class="keywordflow">if</span> (!crc_table_computed)</div>
<div class="line"><a id="l01005" name="l01005"></a><span class="lineno"> 1005</span>            {</div>
<div class="line"><a id="l01006" name="l01006"></a><span class="lineno"> 1006</span>                MakeCRCtable();</div>
<div class="line"><a id="l01007" name="l01007"></a><span class="lineno"> 1007</span>            }</div>
<div class="line"><a id="l01008" name="l01008"></a><span class="lineno"> 1008</span> </div>
<div class="line"><a id="l01009" name="l01009"></a><span class="lineno"> 1009</span>            <span class="keywordflow">for</span> (n = 0; n &lt; length; n++)</div>
<div class="line"><a id="l01010" name="l01010"></a><span class="lineno"> 1010</span>            {</div>
<div class="line"><a id="l01011" name="l01011"></a><span class="lineno"> 1011</span>                c = crc_table[(c ^ buf[n]) &amp; 0xff] ^ (c &gt;&gt; 8);</div>
<div class="line"><a id="l01012" name="l01012"></a><span class="lineno"> 1012</span>            }</div>
<div class="line"><a id="l01013" name="l01013"></a><span class="lineno"> 1013</span>            <span class="keywordflow">return</span> c;</div>
<div class="line"><a id="l01014" name="l01014"></a><span class="lineno"> 1014</span>        }</div>
<div class="line"><a id="l01015" name="l01015"></a><span class="lineno"> 1015</span> </div>
<div class="line"><a id="l01016" name="l01016"></a><span class="lineno"> 1016</span>        <span class="comment">/* Return the CRC of the bytes buf[0..len-1]. */</span></div>
<div class="line"><a id="l01017" name="l01017"></a><span class="lineno"> 1017</span>        <span class="keyword">public</span> <span class="keyword">static</span> uint ComputeCRC(Stream buf)</div>
<div class="line"><a id="l01018" name="l01018"></a><span class="lineno"> 1018</span>        {</div>
<div class="line"><a id="l01019" name="l01019"></a><span class="lineno"> 1019</span>            <span class="keywordflow">return</span> UpdateCRC(0xffffffff, buf) ^ 0xffffffff;</div>
<div class="line"><a id="l01020" name="l01020"></a><span class="lineno"> 1020</span>        }</div>
<div class="line"><a id="l01021" name="l01021"></a><span class="lineno"> 1021</span> </div>
<div class="line"><a id="l01022" name="l01022"></a><span class="lineno"> 1022</span>        <span class="keyword">public</span> <span class="keyword">static</span> uint ComputeCRC(<span class="keywordtype">byte</span>[] buf, <span class="keywordtype">int</span> length, <span class="keywordtype">byte</span>[] prefix)</div>
<div class="line"><a id="l01023" name="l01023"></a><span class="lineno"> 1023</span>        {</div>
<div class="line"><a id="l01024" name="l01024"></a><span class="lineno"> 1024</span>            uint temp = UpdateCRC(0xffffffff, prefix, prefix.Length);</div>
<div class="line"><a id="l01025" name="l01025"></a><span class="lineno"> 1025</span>            <span class="keywordflow">return</span> UpdateCRC(temp, buf, length) ^ 0xffffffff;</div>
<div class="line"><a id="l01026" name="l01026"></a><span class="lineno"> 1026</span>        }</div>
<div class="line"><a id="l01027" name="l01027"></a><span class="lineno"> 1027</span>    }</div>
<div class="line"><a id="l01028" name="l01028"></a><span class="lineno"> 1028</span> </div>
<div class="line"><a id="l01029" name="l01029"></a><span class="lineno"> 1029</span>    <span class="keyword">internal</span> <span class="keyword">static</span> <span class="keyword">class </span>StreamUtils</div>
<div class="line"><a id="l01030" name="l01030"></a><span class="lineno"> 1030</span>    {</div>
<div class="line"><a id="l01031" name="l01031"></a><span class="lineno"> 1031</span>        <span class="keyword">public</span> <span class="keyword">static</span> <span class="keywordtype">void</span> WriteASCIIString(<span class="keyword">this</span> Stream sr, <span class="keywordtype">string</span> val)</div>
<div class="line"><a id="l01032" name="l01032"></a><span class="lineno"> 1032</span>        {</div>
<div class="line"><a id="l01033" name="l01033"></a><span class="lineno"> 1033</span>            <span class="keywordflow">foreach</span> (<span class="keywordtype">char</span> c <span class="keywordflow">in</span> val)</div>
<div class="line"><a id="l01034" name="l01034"></a><span class="lineno"> 1034</span>            {</div>
<div class="line"><a id="l01035" name="l01035"></a><span class="lineno"> 1035</span>                sr.WriteByte((<span class="keywordtype">byte</span>)c);</div>
<div class="line"><a id="l01036" name="l01036"></a><span class="lineno"> 1036</span>            }</div>
<div class="line"><a id="l01037" name="l01037"></a><span class="lineno"> 1037</span>        }</div>
<div class="line"><a id="l01038" name="l01038"></a><span class="lineno"> 1038</span> </div>
<div class="line"><a id="l01039" name="l01039"></a><span class="lineno"> 1039</span>        <span class="keyword">internal</span> <span class="keyword">static</span> MemoryStream ZLibCompress(IntPtr memoryAddress, <span class="keywordtype">int</span> memoryLength)</div>
<div class="line"><a id="l01040" name="l01040"></a><span class="lineno"> 1040</span>        {</div>
<div class="line"><a id="l01041" name="l01041"></a><span class="lineno"> 1041</span>            MemoryStream compressedStream = <span class="keyword">new</span> MemoryStream();</div>
<div class="line"><a id="l01042" name="l01042"></a><span class="lineno"> 1042</span>            compressedStream.Write(<span class="keyword">new</span> <span class="keywordtype">byte</span>[] { 0x78, 0x01 }, 0, 2);</div>
<div class="line"><a id="l01043" name="l01043"></a><span class="lineno"> 1043</span> </div>
<div class="line"><a id="l01044" name="l01044"></a><span class="lineno"> 1044</span>            <span class="keywordtype">byte</span>[] buffer = <span class="keyword">new</span> <span class="keywordtype">byte</span>[1024];</div>
<div class="line"><a id="l01045" name="l01045"></a><span class="lineno"> 1045</span> </div>
<div class="line"><a id="l01046" name="l01046"></a><span class="lineno"> 1046</span>            AdlerHolder adlerHolder = <span class="keyword">new</span> AdlerHolder();</div>
<div class="line"><a id="l01047" name="l01047"></a><span class="lineno"> 1047</span> </div>
<div class="line"><a id="l01048" name="l01048"></a><span class="lineno"> 1048</span>            <span class="keyword">using</span> (DeflateStream deflate = <span class="keyword">new</span> DeflateStream(compressedStream, CompressionLevel.Optimal, <span class="keyword">true</span>))</div>
<div class="line"><a id="l01049" name="l01049"></a><span class="lineno"> 1049</span>            {</div>
<div class="line"><a id="l01050" name="l01050"></a><span class="lineno"> 1050</span>                <span class="keywordflow">while</span> (memoryLength &gt; 0)</div>
<div class="line"><a id="l01051" name="l01051"></a><span class="lineno"> 1051</span>                {</div>
<div class="line"><a id="l01052" name="l01052"></a><span class="lineno"> 1052</span>                    <span class="keywordtype">int</span> currentBytes = Math.Min(memoryLength, 1024);</div>
<div class="line"><a id="l01053" name="l01053"></a><span class="lineno"> 1053</span>                    Marshal.Copy(memoryAddress, buffer, 0, currentBytes);</div>
<div class="line"><a id="l01054" name="l01054"></a><span class="lineno"> 1054</span>                    deflate.Write(buffer, 0, currentBytes);</div>
<div class="line"><a id="l01055" name="l01055"></a><span class="lineno"> 1055</span>                    memoryLength -= currentBytes;</div>
<div class="line"><a id="l01056" name="l01056"></a><span class="lineno"> 1056</span>                    memoryAddress = IntPtr.Add(memoryAddress, currentBytes);</div>
<div class="line"><a id="l01057" name="l01057"></a><span class="lineno"> 1057</span>                    Adler32(buffer, currentBytes, adlerHolder);</div>
<div class="line"><a id="l01058" name="l01058"></a><span class="lineno"> 1058</span>                }</div>
<div class="line"><a id="l01059" name="l01059"></a><span class="lineno"> 1059</span>            }</div>
<div class="line"><a id="l01060" name="l01060"></a><span class="lineno"> 1060</span> </div>
<div class="line"><a id="l01061" name="l01061"></a><span class="lineno"> 1061</span> </div>
<div class="line"><a id="l01062" name="l01062"></a><span class="lineno"> 1062</span>            uint checksum = (adlerHolder.s2 &lt;&lt; 16) + adlerHolder.s1;</div>
<div class="line"><a id="l01063" name="l01063"></a><span class="lineno"> 1063</span> </div>
<div class="line"><a id="l01064" name="l01064"></a><span class="lineno"> 1064</span>            compressedStream.Write(<span class="keyword">new</span> <span class="keywordtype">byte</span>[] { (<span class="keywordtype">byte</span>)((checksum &gt;&gt; 24) &amp; 255), (byte)((checksum &gt;&gt; 16) &amp; 255), (<span class="keywordtype">byte</span>)((checksum &gt;&gt; 8) &amp; 255), (byte)(checksum &amp; 255) }, 0, 4);</div>
<div class="line"><a id="l01065" name="l01065"></a><span class="lineno"> 1065</span> </div>
<div class="line"><a id="l01066" name="l01066"></a><span class="lineno"> 1066</span>            compressedStream.Seek(0, SeekOrigin.Begin);</div>
<div class="line"><a id="l01067" name="l01067"></a><span class="lineno"> 1067</span> </div>
<div class="line"><a id="l01068" name="l01068"></a><span class="lineno"> 1068</span>            <span class="keywordflow">return</span> compressedStream;</div>
<div class="line"><a id="l01069" name="l01069"></a><span class="lineno"> 1069</span>        }</div>
<div class="line"><a id="l01070" name="l01070"></a><span class="lineno"> 1070</span> </div>
<div class="line"><a id="l01071" name="l01071"></a><span class="lineno"> 1071</span>        <span class="keyword">internal</span> <span class="keyword">static</span> uint Adler32(Stream contentStream)</div>
<div class="line"><a id="l01072" name="l01072"></a><span class="lineno"> 1072</span>        {</div>
<div class="line"><a id="l01073" name="l01073"></a><span class="lineno"> 1073</span>            uint s1 = 1;</div>
<div class="line"><a id="l01074" name="l01074"></a><span class="lineno"> 1074</span>            uint s2 = 0;</div>
<div class="line"><a id="l01075" name="l01075"></a><span class="lineno"> 1075</span> </div>
<div class="line"><a id="l01076" name="l01076"></a><span class="lineno"> 1076</span>            <span class="keywordtype">int</span> readByte;</div>
<div class="line"><a id="l01077" name="l01077"></a><span class="lineno"> 1077</span> </div>
<div class="line"><a id="l01078" name="l01078"></a><span class="lineno"> 1078</span>            <span class="keywordflow">while</span> ((readByte = contentStream.ReadByte()) &gt;= 0)</div>
<div class="line"><a id="l01079" name="l01079"></a><span class="lineno"> 1079</span>            {</div>
<div class="line"><a id="l01080" name="l01080"></a><span class="lineno"> 1080</span>                s1 = (s1 + (byte)readByte) % 65521U;</div>
<div class="line"><a id="l01081" name="l01081"></a><span class="lineno"> 1081</span>                s2 = (s2 + s1) % 65521U;</div>
<div class="line"><a id="l01082" name="l01082"></a><span class="lineno"> 1082</span>            }</div>
<div class="line"><a id="l01083" name="l01083"></a><span class="lineno"> 1083</span> </div>
<div class="line"><a id="l01084" name="l01084"></a><span class="lineno"> 1084</span>            <span class="keywordflow">return</span> (s2 &lt;&lt; 16) + s1;</div>
<div class="line"><a id="l01085" name="l01085"></a><span class="lineno"> 1085</span>        }</div>
<div class="line"><a id="l01086" name="l01086"></a><span class="lineno"> 1086</span> </div>
<div class="line"><a id="l01087" name="l01087"></a><span class="lineno"> 1087</span> </div>
<div class="line"><a id="l01088" name="l01088"></a><span class="lineno"> 1088</span>        <span class="keyword">internal</span> <span class="keyword">class </span>AdlerHolder</div>
<div class="line"><a id="l01089" name="l01089"></a><span class="lineno"> 1089</span>        {</div>
<div class="line"><a id="l01090" name="l01090"></a><span class="lineno"> 1090</span>            <span class="keyword">public</span> uint s1;</div>
<div class="line"><a id="l01091" name="l01091"></a><span class="lineno"> 1091</span>            <span class="keyword">public</span> uint s2;</div>
<div class="line"><a id="l01092" name="l01092"></a><span class="lineno"> 1092</span> </div>
<div class="line"><a id="l01093" name="l01093"></a><span class="lineno"> 1093</span>            <span class="keyword">public</span> AdlerHolder()</div>
<div class="line"><a id="l01094" name="l01094"></a><span class="lineno"> 1094</span>            {</div>
<div class="line"><a id="l01095" name="l01095"></a><span class="lineno"> 1095</span>                s1 = 1;</div>
<div class="line"><a id="l01096" name="l01096"></a><span class="lineno"> 1096</span>                s2 = 0;</div>
<div class="line"><a id="l01097" name="l01097"></a><span class="lineno"> 1097</span>            }</div>
<div class="line"><a id="l01098" name="l01098"></a><span class="lineno"> 1098</span>        }</div>
<div class="line"><a id="l01099" name="l01099"></a><span class="lineno"> 1099</span> </div>
<div class="line"><a id="l01100" name="l01100"></a><span class="lineno"> 1100</span>        <span class="keyword">internal</span> <span class="keyword">static</span> <span class="keywordtype">void</span> Adler32(<span class="keywordtype">byte</span>[] buffer, <span class="keywordtype">int</span> length, AdlerHolder holder)</div>
<div class="line"><a id="l01101" name="l01101"></a><span class="lineno"> 1101</span>        {</div>
<div class="line"><a id="l01102" name="l01102"></a><span class="lineno"> 1102</span>            <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i &lt; length; i++)</div>
<div class="line"><a id="l01103" name="l01103"></a><span class="lineno"> 1103</span>            {</div>
<div class="line"><a id="l01104" name="l01104"></a><span class="lineno"> 1104</span>                holder.s1 = (holder.s1 + buffer[i]) % 65521U;</div>
<div class="line"><a id="l01105" name="l01105"></a><span class="lineno"> 1105</span>                holder.s2 = (holder.s2 + holder.s1) % 65521U;</div>
<div class="line"><a id="l01106" name="l01106"></a><span class="lineno"> 1106</span>            }</div>
<div class="line"><a id="l01107" name="l01107"></a><span class="lineno"> 1107</span>        }</div>
<div class="line"><a id="l01108" name="l01108"></a><span class="lineno"> 1108</span>    }</div>
<div class="line"><a id="l01109" name="l01109"></a><span class="lineno"> 1109</span>}</div>
<div class="ttc" id="aclass_vect_sharp_1_1_animated_p_n_g_1_1_compressed_frame_html"><div class="ttname"><a href="class_vect_sharp_1_1_animated_p_n_g_1_1_compressed_frame.html">VectSharp.AnimatedPNG.CompressedFrame</a></div><div class="ttdoc">Represents an individual frame of a PNG animation.</div><div class="ttdef"><b>Definition:</b> <a href="_image_formats_8cs_source.html#l00056">ImageFormats.cs:57</a></div></div>
<div class="ttc" id="aclass_vect_sharp_1_1_animated_p_n_g_1_1_compressed_frame_html_a424da0e063955f0d19ecc46d51331b04"><div class="ttname"><a href="class_vect_sharp_1_1_animated_p_n_g_1_1_compressed_frame.html#a424da0e063955f0d19ecc46d51331b04">VectSharp.AnimatedPNG.CompressedFrame.Duration</a></div><div class="ttdeci">double Duration</div><div class="ttdoc">The duration of the frame in milliseconds.</div><div class="ttdef"><b>Definition:</b> <a href="_image_formats_8cs_source.html#l00064">ImageFormats.cs:64</a></div></div>
<div class="ttc" id="aclass_vect_sharp_1_1_animated_p_n_g_1_1_compressed_frame_html_a55ad3c2d0f0e2e5b8b1110d2a7be2ff0"><div class="ttname"><a href="class_vect_sharp_1_1_animated_p_n_g_1_1_compressed_frame.html#a55ad3c2d0f0e2e5b8b1110d2a7be2ff0">VectSharp.AnimatedPNG.CompressedFrame.CompressedFrame</a></div><div class="ttdeci">unsafe CompressedFrame(DisposableIntPtr rawFrameData, int width, int height, bool hasAlpha, double duration)</div><div class="ttdoc">Creates a new CompressedFrame from raw pixel data in RGB or RGBA format.</div><div class="ttdef"><b>Definition:</b> <a href="_image_formats_8cs_source.html#l00076">ImageFormats.cs:76</a></div></div>
<div class="ttc" id="aclass_vect_sharp_1_1_animated_p_n_g_1_1_compressed_frame_html_a8802f282ddd41df64174f00d1e4b3600"><div class="ttname"><a href="class_vect_sharp_1_1_animated_p_n_g_1_1_compressed_frame.html#a8802f282ddd41df64174f00d1e4b3600">VectSharp.AnimatedPNG.CompressedFrame.Dispose</a></div><div class="ttdeci">void Dispose()</div><div class="ttdef"><b>Definition:</b> <a href="_image_formats_8cs_source.html#l00165">ImageFormats.cs:165</a></div></div>
<div class="ttc" id="aclass_vect_sharp_1_1_animated_p_n_g_1_1_compressed_frame_html_aeb21a7f80af6b57029f09cdeb3cedeec"><div class="ttname"><a href="class_vect_sharp_1_1_animated_p_n_g_1_1_compressed_frame.html#aeb21a7f80af6b57029f09cdeb3cedeec">VectSharp.AnimatedPNG.CompressedFrame.CompressedFrame</a></div><div class="ttdeci">unsafe CompressedFrame(DisposableIntPtr rawFrameData, DisposableIntPtr otherFrameData, bool isFirstFrame, int width, int height, bool hasAlpha, double duration)</div><div class="ttdoc">Creates a new CompressedFrame from raw pixel data in RGB or RGBA format, applying inter-frame compres...</div><div class="ttdef"><b>Definition:</b> <a href="_image_formats_8cs_source.html#l00093">ImageFormats.cs:93</a></div></div>
<div class="ttc" id="aclass_vect_sharp_1_1_animated_p_n_g_html"><div class="ttname"><a href="class_vect_sharp_1_1_animated_p_n_g.html">VectSharp.AnimatedPNG</a></div><div class="ttdoc">Contains methods to create animated PNG image files.</div><div class="ttdef"><b>Definition:</b> <a href="_image_formats_8cs_source.html#l00030">ImageFormats.cs:31</a></div></div>
<div class="ttc" id="aclass_vect_sharp_1_1_animated_p_n_g_html_a56613107ced2d0c6322fa834270c00b5"><div class="ttname"><a href="class_vect_sharp_1_1_animated_p_n_g.html#a56613107ced2d0c6322fa834270c00b5">VectSharp.AnimatedPNG.Create</a></div><div class="ttdeci">static unsafe void Create(Stream outputStream, int width, int height, bool hasAlpha, IReadOnlyList&lt; CompressedFrame &gt; compressedFrames, int repeatCount)</div><div class="ttdoc">Create a new animated PNG image, outputting it to the specified stream.</div><div class="ttdef"><b>Definition:</b> <a href="_image_formats_8cs_source.html#l00181">ImageFormats.cs:181</a></div></div>
<div class="ttc" id="aclass_vect_sharp_1_1_animated_p_n_g_html_ac87e8fb45a427615d2645ba751e5d09a"><div class="ttname"><a href="class_vect_sharp_1_1_animated_p_n_g.html#ac87e8fb45a427615d2645ba751e5d09a">VectSharp.AnimatedPNG.InterframeCompression</a></div><div class="ttdeci">InterframeCompression</div><div class="ttdoc">Types of inter-frame compression.</div><div class="ttdef"><b>Definition:</b> <a href="_image_formats_8cs_source.html#l00035">ImageFormats.cs:36</a></div></div>
<div class="ttc" id="aclass_vect_sharp_1_1_disposable_int_ptr_html"><div class="ttname"><a href="class_vect_sharp_1_1_disposable_int_ptr.html">VectSharp.DisposableIntPtr</a></div><div class="ttdoc">An IDisposable wrapper around an IntPtr that frees the allocated memory when it is disposed.</div><div class="ttdef"><b>Definition:</b> <a href="_raster_image_8cs_source.html#l00054">RasterImage.cs:55</a></div></div>
<div class="ttc" id="aclass_vect_sharp_1_1_disposable_int_ptr_html_a302f3352139ebeac272a6e212503ba5b"><div class="ttname"><a href="class_vect_sharp_1_1_disposable_int_ptr.html#a302f3352139ebeac272a6e212503ba5b">VectSharp.DisposableIntPtr.InternalPointer</a></div><div class="ttdeci">readonly IntPtr InternalPointer</div><div class="ttdoc">The pointer to the unmanaged memory.</div><div class="ttdef"><b>Definition:</b> <a href="_raster_image_8cs_source.html#l00059">RasterImage.cs:59</a></div></div>
<div class="ttc" id="anamespace_vect_sharp_html"><div class="ttname"><a href="namespace_vect_sharp.html">VectSharp</a></div><div class="ttdef"><b>Definition:</b> <a href="_animation_8cs_source.html#l00025">Animation.cs:26</a></div></div>
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